4
1Keywords:
addition
discussion
estimation
Students estimate an addition problem, share their methods, discuss grouping nice numbers, and then do a problem using this method, then design a question showing how it uses the method.
1
3
0
4
8
4
16
0
3
3
2
2
5
1
2
1
2
4
3
0
5
13
4
2
0
