
Fractions Answers 1

Let's see how you got on:
 15/20
Easy common factor of 5, so cancels down to 3/4
 9/27
Two obvious factors of 3 and 9. Always pick the highest:
9/27 ... 1/3
 14/42
Both top and bottom are even numbers, so divide by 2 first:
7/21 ... now obvious common factor of 7, so 1/3

I hope you got those right! Two key points came out of this:
 always divide by the highest common factor, if you spot it.
 if both numbers are even, divide by 2 first!
In (2) had we divided by 3, we'd have done: 9/27 ... 3/9 ... 1/3.
Not hard, but boring!
