May be to your discussion.
7. here's how mo solved the subtraction problem
635 - 813:
635
- 813
- 222
mo did this by working from right to left, saying
5 – 3 = 2
3 - 1 = 2
6 - 8 = -2
a. is mo's answer right?
b. solve
6(100) + 3(10) + 5(1)
- [8(100) + 1(10) + 3(1)]
by working with expanded forms. discuss how
mo's work compares with your work in expanded
forms.