Our new mental math strategy

This week's mental math strategy is making our brains work SO hard!
We are focusing on the multiplication strategy - "Halving and Doubling."

If one number is even, you can cut it in half and double the other number.
This can give you an easier problem to solve!

Ex: 4 x 15
Half of 4, Double 15.
2 x 30
= 60

Ex: 6 x 65
Half of 6, Double 65
3 x 130
= 390

Ex: 15 x 8
Double 15, Half of 8
30 x 4
= 120

You can even keep on halving and doubling if it helps...

Ex: 18 x 8
Double 18, Half of 8
36 x 4
Double 36, Half of 4
72 x 2
= 144

We will be correcting Section A of this lesson on Thursday and Section B of this lesson on Friday.
Practicing our multiplication and division skills will help us review our basic facts and will help us as we continue our work with equivalent fractions!
Bonne chance! :)