Answer:
[tex] \frac{12}{63} \: and \: \frac{14}{63} [/tex]
Step-by-step 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
[tex] \frac{4}{21} = \frac{?}{63} [/tex]
21 × 3 = 63, so do the same to the numerator.
4 × 3 = 12 the numerator is 12
[tex] \frac{4}{12} = \frac{12}{63} [/tex]
let's do the same to 2/9
[tex] \frac{2}{9} = \frac{?}{63} [/tex]
9 × 7 = 63, so do the same to the numerator.
2 × 7 = 14
the numerator is 14
[tex] \frac{2}{9} = \frac{14}{63} [/tex]
