Wednesday, 20 May 2015

Prove It To Move It

Can I use doubling and halving to solve 2’s, 5’s and 10’s mult/div problems?
18 x 5 =
9x10
=90

12 x 5 =
6x10=60

I have 4 cows on my farm. How many legs are there in total?
4x4=2x8=16

I went to the shop and bought 4 bags of lollies, each bag has 20 lollies. How many lollies do I have altogether?
4x20=8x10=80

In class 5 people have 40 colouring in pencils each. How many do they have altogether 
5x40=10x20=200

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