Doubling And Halving Strategy

 In class we learned a new strategy called Doubling and halving 

When you do this strategy you look to see how you can make it easier

For Example 

5 x 48

You could half 48, which then becomes 24 then you double the 5 and it becomes 10. 

Now you can time 24 by 10 =  240

4 x 16

First you double 4, then that becomes 8, now you half 16 and that becomes 8

8x8=6