15-Let’s Add and Subtract by Jumping
The jumping strategy is a key one for mental calculation.
Let’s see how ...
2-Let’s Subtract by Jumping
The jumping strategy is a key one for mental calculation.
Let’s see how ...
1-Let’s Add by Jumping
The jumping strategy is a key one for mental calculation.
Let’s see how ...
7-Let’s Add and Subtract by Jumping
The jumping strategy is a key one for mental calculation.
Let’s see how ...