### 6-Let’s Estimate

On a daily basis, we do not have to make exact calculations very ...

On a daily basis, we do not have to make exact calculations very ...

Deducing facts based on others we are already aware of, is a crucial ...

The breaking down strategy is a key one for written calculation.
Let’s see ...

The breaking down strategy is a key one for written calculation.
Let’s see ...

The jumping strategy is a key one for mental calculation.
Let’s see how ...

The jumping strategy is a key one for mental calculation.
Let’s see how ...

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