10 videos36 docs23 tests

00:07  Understanding Addition 
01:03  Addition on the Number line 
01:45  Addition Facts 
02:32  Adding Numbers Horizontally and Vertically 
03:01  Adding Three Numbers 
03:23  Understanding Subtraction 
03:53  Subtraction by Counting Backward 
05:35  Subtraction on the Number line 
06:19  Subtraction Facts 
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