It was cooking night with the 13yo the other night. Along the way we needed two cups of Bisquick (long funny story I'll tell you another time. For now don't judge.)
We used the 1 cup measure. But a minute later I pulled out the 2/3 and asked whether we *could* have used it.
[Pause]
"Yes."
How do you know?
#tmwyk
I'll tell you how she knew later. I'm curious how you know.
As always, you people are amazing.
Here is the 13yo's solution.
2 cups is 6 thirds, which is even. So 2/3 goes into it. QED.
I'm telling you this child is ace with units. Has been for years.
talkingmathwithkids.com/tag/tens/
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