First In Math @FirstInMath
First In Math® is an online math program from the makers of the 24® Game - Energizing Every Child to Learn, Love & Live Math™ #education #distancelearning #math firstinmath.com Easton, PA Joined July 2012-
Tweets17K
-
Followers3K
-
Following993
-
Likes34K
First In Math retweeted
Fantastic @FirstInMath Friday! Check out the amazing VIFs progress made in the first month of school. @RobertSun24 @MrsJimenezBASD
1
3
4
191
0
Download Image
First In Math retweeted
Introduced my favourite @24game to my y7 class in my new school. Loved the energic atmosphere this creates. ##MathsToday
First In Math retweeted
Celebrating "Leveling Up" on the @FirstInMath Wall of Fame. @MDCityAACPS mathematicians are excited to have FIM back this year! @RobertSun24 #BelongGrowSucceed
First In Math retweeted
@MrPhillipsTeach @FirstInMath @MrsJimenezBASD @LisaBoscola Thank you @SenLisaBoscola for your support of mathematics achievement for students in your Senate District! @PADeptofEd
First In Math retweeted
Well the Marvine Mustangs are trotting to great things on @FirstInMath @MrsJimenezBASD @RobertSun24
First In Math retweeted
Our Caley students were recently awarded an amazing banner for being #1 in First in Math in Montgomery County. Way to Go, Cougars!🌟🐾 @RobertSun24 @FirstInMath
First In Math retweeted
Get ready to watch us grow as mathematicians in this year! @FirstInMath @RobertSun24
First In Math retweeted
Talk about Motivated Mathematicians--we set our Goals Index goal on Tuesday (88 this year) and look at the progress made in two days!! @RobertSun24 @MrsJimenezBASD @FirstInMath @Leesonscience @SenLisaBoscola @24game @Kane19Kane @Mrs_Kling_Tech
First In Math retweeted
We had a very busy 1st day of 4th grade and we got our annual tradition accomplished——logging into @FirstInMath @RobertSun24 @MrsJimenezBASD
First In Math retweeted
It works—fluency tools to support your curriculum. firstinmath.com @RobertSun24
First In Math retweeted
Let the adventure begin on Monday! Here’s to year 24! (24 is such a great number @24game ) @RobertSun24 @MrsJimenezBASD @FirstInMath
First In Math retweeted
Sweet spots in First In Math for a teacher training. @FirstInMath Here at Southern Lehigh School District doing a hands-on training. What does intentional use of a digital tool look like? @ISTEofficial @NCTM
First In Math retweeted
Watch “24 Game How To Play” on #Vimeo vimeo.com/1013357391?fe=…
First In Math retweeted
Freeman proposal focuses on improving math fluency in PA schools - goo.gl/alerts/9TFwgb #GoogleAlerts @FirstInMath @NCTM @AMTNYS @NYSEDNews
Congrats Jamie Spohn - you earned the May 2025 @FirstInMath Spirit In Education™ Award for being social about Math & sharing your enthusiasm throughout the month! DM us to receive your official Certificate & Badge! @jspohnUMASD @CaleyUMASD @UpperMerionSD @PADeptofEd
First In Math retweeted
🚀 Two of our MS Ss had an incredible experience, diving into science, technology, engineering, and math at the STEM YEA Camp at Kutztown University. Thank you to the Nazareth Rotary for sponsoring these students.
First In Math retweeted
‘Cognitive Science,’ All the Rage in British Schools, Fails to Register in U.S. @The74 the74million.org/article/cognit…
First In Math retweeted
On my way to connect w/ teachers X Pennsylvania at PCTM 2025 in Harrisburg. My car is loaded up w/ extra copies of Factor Wheels & 24® Game 2 share w/ session participants. @PCTMpctm @NCTM @ISTEofficial @PADeptofEd @GovernorShapiro @Sen_Pennycuick @SenLisaBoscola #Math #EdTech
First In Math retweeted
Stop that #summerslide by hitting a homerun with @FirstInMath!
Stop that #summerslide by hitting a homerun with @FirstInMath!
Join @FirstInMath & @24game creator @RobertSun24 at PCTM25! July 24, 2-3pm HERITAGE Room: "Keys to Problem Solving: Teach Children to Define & Penetrate a Problem." Sun will share secrets to help focus K to 9 students. Unlock new leadership skills, leave with a 24 game! @PCTMpctm
Jack Silva @basdjacksilva
6K Followers 2K Following Superintendent of the @BethlehemAreaSD. Sharing the good news of the BASD schools and the #BASDcommunity everyday.
Robert Sun @RobertSun24
10K Followers 9K Following Inventor of 24® game and @FirstInMath online. Engineer, Social entrepreneur, TEDx speaker, contributor to Huffington Post, London Economic, NCSM, EdTech Times
BASD @BethlehemAreaSD
7K Followers 1K Following The Twitter account of the Bethlehem Area School District. For comprehensive information, questions, and comments: https://t.co/cjBFHMBkXo
Mr. Phillips @MrPhillipsTeach
289 Followers 224 Following Welcome to the adventures of Mr. Phillips and his class at Marvine Elementary. Watch the exciting things we are learning and doing this year!!
Donegan Elementary @DoneganBASD
1K Followers 611 Following Empower students to be lifelong learners&future leaders in their community,using heart,mind&body #ShineBright #BrillaBrillante #LightTheWay #iluminamosElCamino
Monica Patel @AboutImpact
4K Followers 2K Following CEO,First in Math® #education #autism mom #maths #schools #India #USA #students #DigitalIndia partner #inclusion #SDG #strategist
Fountain Hill Element... @BASDFtHill
1K Followers 564 Following Fountain Hill Elementary School #BASDProud It’s a THRILL on THE HILL! 🐯 INSTAGRAM:https://t.co/Jd3UBJYy9J
Amanda Wood @MrsWood__
683 Followers 506 Following Kindergarten Teacher at Oak Tree Road • Google Certified Trainer • Developmental Interventionist • M.Ed. Early Childhood Education 🌎🖍📚
Glen Burnie Park @gbparkaacps
918 Followers 230 Following Proud AACPS elementary school in Glen Burnie, MD. #BeTheDifference
Jennifer Kling @Mrs_Kling_Tech
1K Followers 2K Following Suntex International Inc, Seeking healthy delicious street foods and metal weavers. #Goldsmith #math #CS
Julia's #STEAMing up ... @GiftedTawk
47K Followers 38K Following When I was young I didn’t know much about being a teacher. But after years of hard work, I am no longer young.
Mrs.Jimenez @MrsJimenezBASD
283 Followers 255 Following Principal at Marvine Elementary School, BASD. Encouraging, empowering, and educating the leaders of tomorrow.
Rishikesh Patankar @PatankarRishi
35K Followers 10K Following Ph.D, M.Tech-CS,M.Phil-IT, MCA , NET , FIETE, Working with NSDC ,Ex- Indian Navy , Aspiring Triathlete🏊♂️🏃♂️🚴♂️ IronMan , Lohpurush 70.3
Joanie Gulden @JGulden22
329 Followers 593 Following Math Title I Teacher at Glen Burnie Park Elementary @gbpesmath PAEMST Awardee
Margaret Truppa. @MargaretTruppa
1K Followers 1K Following Principal @Menlo Park Terrace School #19 and Mom of an amazing son!
edutopia @edutopia
1.2M Followers 58K Following Sharing what works in education. 💡 Edutopia is an initiative of the George Lucas Educational Foundation.
Dr. Erika Garcia @flyingmonkey13
42K Followers 22K Following petite spitfire, student advocate, teacher supporter, passionate educator, elementary principal, beautiful disaster, justice seeker, she her, tweets mine
Japleen Kaur @japleen_kaur1
2K Followers 2K Following Secondary Maths Teacher. London Branch secretary for MA & ATM.
Adam Lewis @AdamLew55608213
42 Followers 1K Following
Rasies @Rasies5666218
8 Followers 1K Following
Jacob Enfield @JEnfield18369
19 Followers 434 Following I make math games! CEO Second Job Studios LLC, Professor of Game Design, math teacher, homeschool parent, author (Mathematics of Game Dev).
YouthCentral India @YouthcentralInd
3 Followers 30 Following Smart Parenting..Simplified! Explore your passion & opportunities. Youth Central: Where young dreams find real adventures!
Guaealau @Guaealau244160
21 Followers 1K Following
Quumau @Quumau790
25 Followers 1K Following
Math and Beyond @MathAndBeyond11
1 Followers 27 Following Providing Math Resources for Elementary Teachers
Eakawvor @Eakawvor524793
27 Followers 1K Following
Qiepi @Qiepi6088931
32 Followers 1K Following
Sharon Forman @sharondforman
490 Followers 898 Following Math & Education Consultant ~ Retired Math Coach/Teacher~ Absolutely Love Math ~ Passionate about Teaching and Learning ~ Wife ~ Mom ~ Runner
Florin R Prihotin @Florin_Prihotin
288 Followers 3K Following eComm professional taking the leap of faith in Frontend Development @StartupInst alum
Markii Jacobs @JustAddMrsJ
3 Followers 12 Following
Rawimee @Rawimee8820
37 Followers 984 Following
AMMac @DOGZ5124
710 Followers 5K Following Big time sports fan/horse racing fan/dfs & fantasy sports player—Progressive/Democrat
Pavan Janasena @urs_pavan2014
2K Followers 3K Following చిరంజీవి అంటే ప్రాణం ...! నాగబాబు అంటే ప్రేమ ..!! పవన్ కళ్యాణ్ అంటే పిచ్చి ...!
Rachelle Brandt @RashellyGirl
2K Followers 5K Following Proud Patriot, wife and mama bear of four. Debt-free thru the Dave Ramsey program! “Thirst was made for water; inquiry for truth.” C.S. Lewis. (NO DM’s please.)
M🚂🇺🇸 @M1108358968138
108 Followers 3K Following
Alpha Whisky @adamjaan
394 Followers 351 Following
DLB @DLB062
623 Followers 5K Following Graduate: Florida Memorial University (Go Lions) Miami Gardens, FL(HBCU PROUD)
Citydweller @Citydweller3
2K Followers 7K Following Retired Commonwealth of Pa employee with 3 grandsons, progressive & very liberal! #BLM #buyfrombrickandmortar https://t.co/JQz0NR5MW2
Assesseth The Oracula... @assesseth
181 Followers 2K Following Assesseth, god of assessment. I say that which is and which is to be shortly. AI/ML by choice, Economics by night, Middle East affairs by necessity.
Karen R @Hoosierswin7473
556 Followers 1K Following Here for the wit & banter that makes Twitter what it is. IU+Indiana 🏀 🏈/Indy 500 🏎️🏁 #indycar.
Corey Walker @CoreyWriting
19K Followers 6K Following Washington Correspondent @Algemeiner 🇺🇸 🇮🇱 📟 Catholic. Chicagoan. Michigan Wolverines Football. Heritage American.
EdTechXperts @EdTechXperts
91 Followers 490 Following Let's build something together 💪 (SaaS, Ai, Agents, Business)
Courtney Beavan @courtney_beavan
63 Followers 173 Following
Kin Shah | @kinshah@d... @TheRockstarDBA
912 Followers 5K Following Sr. DBSRE @Bloomberg - Automation Lover. Opinions are my own ! retweets != endorsement
S̊⫶å⫶n̊⫶d̊... @sandrain2nd
13K Followers 10K Following ⭐2nd Grade Teacher⭐TOY2020⭐#Kindness❤️#Literacy 📚 #DonorsChooseAmbassador Donate-https://t.co/c2H0HGHdlZ #clearthelist
Swouormi @Swouormi34973
41 Followers 682 Following
Manor Intermediate @HFLManor
729 Followers 154 Following Intermediate School for grades 2-5. International Habits of the Mind School of Excellence, Model PLC School and full of Cougar Pride!
Alicia Sewell, Ed.S. @TechySewell
9K Followers 7K Following Educator | SEL Advocate | Curriculum Leader | EdTech Strategist | Consultant
Sara @QuerreYvp99
22 Followers 2K Following I’m just folk。I have mood swings https://t.co/EED3eHN6Ap
Joyful Mathematics @joyfulmaths
565 Followers 427 Following Making Joyful Mathematics Accessible to Everyone! Makers of MULTI & Numeroso.
Frarapoo @Frarapoo301066
41 Followers 828 Following
Hirveab @Hirveab70266
56 Followers 1K Following
Dakota Johnson-Ortiz @MrJohnsonOrtiz
98 Followers 105 Following 7th Grade Math Teacher - Sharks Team - Palmyra Area Middle School - Outdoor Ed - MiniThon - Crochet Club Advisor
Fiorella Perfetto @fiorellaperfett
8K Followers 8K Following Statiscian and Investigative reporter at @TheDiggertw @NAHJ, @IRE_NICAR #TheAuthorGuild, #SIP. Mastodon @[email protected]
Machine learning in B... @ai__analytics
585 Followers 5K Following When #Business #Analytics meets Machine Learning. Machine learning, #ML, #AI, #Algorithms, #businessanalytics
Ivan Blas @imblas
398 Followers 5K Following
Joe Ann @JoeAnn459
2K Followers 36 Following
Matthew Wolfe @wolfereview
873 Followers 5K Following We operate several different businesses. Our main focus FWA service provider @WolfeWireless. We also provide web links to quality products and services.
Arturo B @barrios_tic
294 Followers 2K Following Enseñar y comunicar son los nuevos talentos y negocios de la Sociedad del Conocimiento y Aprendizaje Acumulador de libros sin leer. Biólogo. Aprendiz.
Kendra @ardnekkisbo
1K Followers 2K Following Humanist. Math, science, reason, human rights, animal advocacy, history with a critical eye. No DMs unless working on a project or issue together.
Joe Smith @jcdlkjc
433 Followers 5K Following
Jack Silva @basdjacksilva
6K Followers 2K Following Superintendent of the @BethlehemAreaSD. Sharing the good news of the BASD schools and the #BASDcommunity everyday.
Robert Sun @RobertSun24
10K Followers 9K Following Inventor of 24® game and @FirstInMath online. Engineer, Social entrepreneur, TEDx speaker, contributor to Huffington Post, London Economic, NCSM, EdTech Times
BASD @BethlehemAreaSD
7K Followers 1K Following The Twitter account of the Bethlehem Area School District. For comprehensive information, questions, and comments: https://t.co/cjBFHMBkXo
Mr. Phillips @MrPhillipsTeach
289 Followers 224 Following Welcome to the adventures of Mr. Phillips and his class at Marvine Elementary. Watch the exciting things we are learning and doing this year!!
Donegan Elementary @DoneganBASD
1K Followers 611 Following Empower students to be lifelong learners&future leaders in their community,using heart,mind&body #ShineBright #BrillaBrillante #LightTheWay #iluminamosElCamino
Monica Patel @AboutImpact
4K Followers 2K Following CEO,First in Math® #education #autism mom #maths #schools #India #USA #students #DigitalIndia partner #inclusion #SDG #strategist
Robert Kaplinsky @robertkaplinsky
58K Followers 264 Following Math educator. ❤️ teachers. @openmiddle co-founder. #OpenMiddleBook author. #ObserveMe creator. @GrassrootsWS President. Get my emails: https://t.co/9CQIavz7yD
Fountain Hill Element... @BASDFtHill
1K Followers 564 Following Fountain Hill Elementary School #BASDProud It’s a THRILL on THE HILL! 🐯 INSTAGRAM:https://t.co/Jd3UBJYy9J
AACPS @AACountySchools
65K Followers 360 Following Official Twitter of Anne Arundel County Public Schools, the 37th largest school system in the United States and the fourth largest in MD #BelongGrowSucceed
Amanda Wood @MrsWood__
683 Followers 506 Following Kindergarten Teacher at Oak Tree Road • Google Certified Trainer • Developmental Interventionist • M.Ed. Early Childhood Education 🌎🖍📚
Stephanie Seidl @stephanielseidl
514 Followers 483 Following Mother. Daughter. Sister. Wife. Friend. Educator. Coach. Leader. Learner. Food🍕🍩Music🎷🎵Chucks👟. Principal @ Belvedere Elementary in AACPS.
Glen Burnie Park @gbparkaacps
918 Followers 230 Following Proud AACPS elementary school in Glen Burnie, MD. #BeTheDifference
SolleyAACPS @SolleyAACPS
1K Followers 159 Following ⭐️Connection ⭐️Commitment ⭐️Collaboration⭐️Continued Growth⭐️
Jennifer Kling @Mrs_Kling_Tech
1K Followers 2K Following Suntex International Inc, Seeking healthy delicious street foods and metal weavers. #Goldsmith #math #CS
Julia's #STEAMing up ... @GiftedTawk
47K Followers 38K Following When I was young I didn’t know much about being a teacher. But after years of hard work, I am no longer young.
Mrs.Jimenez @MrsJimenezBASD
283 Followers 255 Following Principal at Marvine Elementary School, BASD. Encouraging, empowering, and educating the leaders of tomorrow.
Eric Fontanez @Efontanez3
687 Followers 247 Following Supervisor of Equity Initiatives for the Bethlehem Area School District.
Japleen Kaur @japleen_kaur1
2K Followers 2K Following Secondary Maths Teacher. London Branch secretary for MA & ATM.
Carlos Ramirez @CRamirezNYS
921 Followers 2K Following Director of Technology and CIO, Educator, Former Coordinator of Technology Policy NYSED. Opinions and tweets are my own.
Mary Fox-Alter @Mary_FoxAlter
999 Followers 268 Following Ossining Superintendent, passionate educator and district leader, a career of multiple fabulous roles! My tweets are my own.
Manor Intermediate @HFLManor
729 Followers 154 Following Intermediate School for grades 2-5. International Habits of the Mind School of Excellence, Model PLC School and full of Cougar Pride!
New York State Museum @nysmuseum
4K Followers 80 Following Explore the New York State Museum! Open Tuesday - Sunday, 9:30 AM - 5:00 PM. Closed on state observed holidays. Free admission; donations appreciated.
Smithtown CSD @SmithtownCSD
3K Followers 102 Following Official Twitter account of the Smithtown Central School District! #SmithtownPride 🐂📚
Linthicum Elementary @LinthicumES
640 Followers 117 Following The official Twitter page of Linthicum Elementary School, which serves nearly 500 students in kindergarten through fifth grade.
Dakota Johnson-Ortiz @MrJohnsonOrtiz
98 Followers 105 Following 7th Grade Math Teacher - Sharks Team - Palmyra Area Middle School - Outdoor Ed - MiniThon - Crochet Club Advisor
Leah Carper @Leah_Carper
1K Followers 894 Following Educator & Engager | 2022 NC Teacher of the Year
Chris Yung Elementary... @ChrisYungES
261 Followers 149 Following “This PWCS social media account has been approved by the PWCS Communications Department.”
Dr. Michael Lucas @TRINITY_MLUCAS
2K Followers 838 Following Trinity Area School District Superintendent
Trinity Area School D... @TrinityAreaSD
1K Followers 96 Following Official Twitter of Trinity Area School District in Washington, PA
TrinityWestElem @west_elem
225 Followers 102 Following Official Twitter page for Trinity West Elementary School! 💙🤍
Florida Department of... @EducationFL
52K Followers 147 Following This is the Florida Department of Education's Twitter account. Follow for up-to-the-minute info on Florida education! Retweet/Follow does not equal endorsement.
Catherine Barrett,M.E... @Kaeseorinn
5K Followers 5K Following 💝Personal Account. Smiles are the start of a lifetime. I choose you in every sunrise, every quiet night.Matthew 5:44
JAG Schools @JAGSchools
2K Followers 111 Following James A. Garfield Local School District is located Northeast Portage County Ohio and serves the village of Garrettsville, Freedom and Nelson Townships.
Southern Lehigh Schoo... @SoLehighSD
552 Followers 3 Following Official Twitter account of the Southern Lehigh School District #SLSDPROUD
Senator Tracy Pennycu... @Sen_Pennycuick
744 Followers 311 Following PA State Senator Pennycuick proudly serving the 24th District in Montgomery and Berks Counties.
Dr. Steven A. Forte @DenvilleSchool
1K Followers 310 Following Denville K-8 Public Schools- Superintendent
Indiana Department of... @EducateIN
34K Followers 489 Following Working Together for Student Success
Cate Scholles 🦈 @EduCaitor
543 Followers 618 Following Instructional Coach | KTI 🌟 2019 |Life Long Learner
MSDofSteubenCounty @MSDofSteuben
1K Followers 128 Following The official Twitter Account for MSD of Steuben County!
Jonathan Winslow @MSDSC_JWins
1K Followers 1K Following Director of Elementary Education @MSDofSteuben, Adjunct Instructor, KINL Innovation Coach
Tamara Solometo @TSolometo
66 Followers 192 Following Director of Curriculum and Instruction K-12🍎 Doctor of Education 👩🎓 Boy mom💙💙
Matt Weimann @MrWeimann
5K Followers 4K Following Coach of #Gifted @epsdWillowLane, @CurriculumAssoc Extraordinary Educator, Class of 2024, wearer of bow ties #BowtieTuesday, Blog https://t.co/wDLnp7mmSR
Woodward Academy @WoodwardAcademy
4K Followers 398 Following Pre-K-12 private college preparatory school serving families in metro Atlanta and Johns Creek, Georgia. Inquire today (link below)!
Peggy Hardy @hardy_peggy
172 Followers 401 Following Mommy to 2 AMAZING kiddos, 5th grade math teacher at Woodward Academy
Mrs. Green @MrsGreenGifted
265 Followers 346 Following Gifted Education Teacher, BASD MaryAnn Green, M.Ed.
Katie Bopf @K_Bopf_CS
49 Followers 62 Following 4th Grade Teacher at Countryside School 🐊💛, Mommy to Shawn & Samantha💙, Crochet Enthusiast 🧶 #bopfsbravebunch 🎓Stockton’17
Julie Overly @JulieOTeach
169 Followers 217 Following Elementary Instructional Coach, Teacher @❤️, Life-Long Learner 📚
JP O'Hare @jpohare1
92 Followers 292 Following Press @NYSEDNews previously @HealthNYGov. Opinions are my own.
Digital Promise @DigitalPromise
33K Followers 780 Following Digital Promise shapes the future of learning and advances equitable education systems by bringing together solutions across research, practice, and technology.
Clayton County Public... @CCPSNews
5K Followers 209 Following Building a Better Tomorrow, Today! The official Twitter account of Clayton County Public Schools! #CCPSBuilders
RollingKnollsES @RollingKnollsES
474 Followers 408 Following
Dr. Pamela Jones Seda @pamseda1
2K Followers 585 Following Math Education Consultant, Creator of the ICUCARE Equity Framework, co-author of #Choosing2See. Visit https://t.co/YoeycpbHoe to work with me.
Rebecca Wenner @techiepusher
1K Followers 2K Following Instructional Technology Integration Specialist TOSA & HS Business Teacher @ESMSchoolDist. Mom of two amazing kids and 4 fur babies. ☮️❤️
ESM Central Schools @ESMSchoolDist
2K Followers 276 Following This is the official X-Twitter account for the East Syracuse Minoa Central School District. We are a Pre-K to Grade 12 district in Central NY.
Molly McGarry @mkmcgarry
85 Followers 140 Following
Dr. Philip DeLizio, E... @mathguy1722
719 Followers 253 Following Doctor of Education, retired teacher. Adjunct college professor, lifelong learner. Award Winning Author. Retweets not intended as endorsements.
Diana Radley @DianaRadley17
686 Followers 1K Following Director of Student Placement, Rochester City School District
RidleySchoolDistrict @RidleyDistrict
2K Followers 65 Following The Official Site of the Ridley School District
HillsmereESAACPS @HillsmereESAACP
705 Followers 1K Following Where hornets become better readers, writers, and mathematicians!
Amanda Wahle @amanda_wahle
25 Followers 61 FollowingTrends for United States
75,7 B posts
28,6 B posts
31,6 B posts
40,1 B posts
9.151 posts
2.968 posts
4.327 posts
2.438 posts
28,7 B posts
6.194 posts
4.857 posts
4.451 posts
1.098 posts
1.044 posts
2.477 posts
1.930 posts
4.446 posts
4.086 posts
75,6 B posts
You might like
Trafera
@TraferaOfficial
1K Followers
24® Game
@24game
2K Followers
Robert Sun
@RobertSun24
10K Followers
AACPS PK-5 Math
@AACPS_PK5Math
1K Followers
Blocksi
@Blocksi1
1K Followers
Daniel Garcia
@MrGBASD
408 Followers
Margie Pearse
@pearse_margie
14K Followers
Mark Stein
@basdfacman
459 Followers
Monica Patel
@AboutImpact
4K Followers
GBPES Math
@GBPESMath
289 Followers
Mr. Phillips
@MrPhillipsTeach
289 Followers
Kathleen Plott
@PlottKplott
734 Followers
iblason
@iblason
15K Followers
ZoudehBASD
@ZoudehB
254 Followers
Mr. Meila
@MrMeila
198 Followers