Question

Can 21/108 be simplified?

Answer 1

Yes it can be simplified because 21 and 108 are multiples of 3.

Use the divisibility by 3 rule to add the digits to check.

• 2+1 = 3 which is a multiple of 3
• 1+0+8 = 9 which is a multiple of 3

Let's divide 21 and 108 by 3 to reduce.

• 21/3 = 7
• 108/3 = 36

The fraction 21/108 reduces to 7/36

We cannot reduce further because 7 and 36 do not have any factors in common other than 1.