Question

Is 4/9 half of 8/18 ?

Answer 1

Yes, because if you multiply 4/9 by 2, you get 8/18. 
So, yes.

Answer 2

Divide by 2 and find out.

4/9 / 2

Multiply by its reciprocal:

4/9 * 1/2

Multiply the numerators and denominators together:

4/18

4/18 does not equal 8/18, so 4/9 isn't half of 8/18.