What does havling and doubling mean in math gr5?

Answer 1

Halving means multiplying the number by 0.5 or 1/2 or dividing by 2, they mean the same thing and will produce the same result. Doubling means multiplying the number by 2 (or dividing by 0.5) but remember whatever is easiest, for example:

Double 5:

2*5=10

Half 14:

14/2=7