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
0
1
0
1
0
6
2
2
0
1
0
4
0
3
6
2
1
2
8
4
1
2
2
8
