Ellen @metzmath

math specialist in a public K-8 school Joined October 2013

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Ellen @metzmath

2 years ago

@pwharris I divided 312 by 2 to get 156, then divided that by 2 to get 78, and finally divided that by 2 to get 39. I know I can do that because 8 is 2^3, or 2 x 2 x 2. So 312 / 8 = 39.

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Ellen @metzmath

3 years ago

@pwharris 4/16 is 1/4, so 1/4 of 1/5 is 1/20 and then 1/4 of the other 1/5 is also 1/20, so both 1/20 together make 1/10.

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I never really thought before about how, when you divide a strip of paper in two, you can label one part 1/2 AND you can label the cut 1/2. And that is not obvious to kids! "Half" is an area and it's a measure of distance. Whoah. #ReachMoreStudents

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Ellen @metzmath

3 years ago

@pwharris I did 12 x .75, or 3/4 of 12 is 9, so 12 x 75 is 100 x that, so it is 900.

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Ellen @metzmath

3 years ago

I am wondering if there is some pattern here that I am missing...I am trying to do YouCubed "30 Cubes" task. youcubed.org/tasks/30-cubes/ How would you respond to a student who made this graph and asked, so what? @youcubed #iteachmath #maths #math

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Ellen @metzmath

3 years ago

@pwharris I know 48 is 2x2x2x2x3 so I divided by 2 four times and then by 3. So I got 588, 294, 147, 73.5, and then to divide 73.5 by 3, I took it apart, first 60 by 3 and getting 20, and then 12 by 3 and getting 4, and then 1.5 by 3 and getting .5. So 24.5. #MathStratChat

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Ellen @metzmath

4 years ago

@Trianglemancsd Stalks grow in all different sizes, and sticks, cut from stalks, can also be in different sizes. So it’s all relative…

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Ellen @metzmath

4 years ago

@howie_hua 80+60 =140. Add 8 to get 168. Subtract 1 to get 167.

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Ellen @metzmath

4 years ago

I see sets of four things all the time… and I just have to take a photo. #wodb #iteachmath

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Ellen @metzmath

4 years ago

@howie_hua 88 + 100 = 188, then subtract 2. 186.

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Ellen @metzmath

4 years ago

Summer-garden-themed wodb #wodb #mtbos #iteachmath #matheducation

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Ellen @metzmath

4 years ago

@howie_hua We are multiplying by ten so we can just “attach” a zero

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Ellen @metzmath

4 years ago

@howie_hua 🤣

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Ellen @metzmath

4 years ago

@howie_hua 42 plus 3/4 of 42. So 42 + (30 + 6/4) = 42 + 31 1/2 = 73 1/2 ounces.

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Ellen @metzmath

5 years ago

@howie_hua Wondering if you could answer this for me: is the equation for a horizontal line, e.g. y = 4, considered a linear equation? Thanks

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Ellen @metzmath

5 years ago

@davidporas Here’s my tip for attending sessions. Go *straight* to your next session without stopping. Put some stuff on a chair to save your place, and only then, if you need to, grab food/drink or use restroom. Enjoy!

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Ellen @metzmath

5 years ago

@msbjacobs @davidporas Love the blog post. Nice progression of ideas. I like that they may have to end up with some negative terms as they get toward the bottom in order to make it work.