Subtract 9/24 from 54/42, Solve 1 12/42

Subtract 9/24 from 54/42

1^st number: 1 12/42, 2^nd number: 9/24

54/42 - 9/24 is 51/56.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 24 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 42 × 4 = 168,
54/42 = 54 × 4/42 × 4 = 216/168
Likewise, for the 2nd fraction, since 24 × 7 = 168,
9/24 = 9 × 7/24 × 7 = 63/168
Subtract the two like fractions:
216/168 - 63/168 = 216 - 63/168 = 153/168
After reducing the fraction, the answer is 51/56

MathStep (Works offline)

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