Subtract 9/21 from 45/24, Solve 1 21/24

Subtract 9/21 from 45/24

1^st number: 1 21/24, 2^nd number: 9/21

45/24 - 9/21 is 81/56.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 24 × 7 = 168,
45/24 = 45 × 7/24 × 7 = 315/168
Likewise, for the 2nd fraction, since 21 × 8 = 168,
9/21 = 9 × 8/21 × 8 = 72/168
Subtract the two like fractions:
315/168 - 72/168 = 315 - 72/168 = 243/168
After reducing the fraction, the answer is 81/56
In mixed form: 125/56

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad