Question

Rewrite 4/21 and 2/9 so that they have a common denominator,

Answer 1

The common denominator between 21 and 9 is 63, the LCM OF them two numbers is 63
So…

12/63 and 14/63

Answer 2

`(12)/(63) \: and \: (14)/(63)`

Explanation:

The lowest common multiple between 21 and 9 is 63 as 21 = 21, 42, 63

9 = 9, 18, 27, 36, 45, 54, 63

therefore the common denominator is 63

`(4)/(21) = (?)/(63)`

21 × 3 = 63, so do the same to the numerator.

4 × 3 = 12 the numerator is 12

`(4)/(12) = (12)/(63)`

let's do the same to 2/9

`(2)/(9) = (?)/(63)`

9 × 7 = 63, so do the same to the numerator.

2 × 7 = 14

the numerator is 14

`(2)/(9) = (14)/(63)`