Model of creating tens in subtraction through decomposing 70 minus 4. Decomposing 70 into 60 and 10. Subtract 4 from 10 to get 6 and then add to 60.
Today's #MathJoy
Working on a consulting project and taking a look at how 2nd graders are seeing instruction for subtraction. I hated "borrowing" when I was a kid. Still do. So I like this model. A lot.