Subtract 9/21 from 54/40, Solve 1 14/40

Subtract 9/21 from 54/40

1^st number: 1 14/40, 2^nd number: 9/21

54/40 - 9/21 is 129/140.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
54/40 = 54 × 21/40 × 21 = 1134/840
Likewise, for the 2nd fraction, since 21 × 40 = 840,
9/21 = 9 × 40/21 × 40 = 360/840
Subtract the two like fractions:
1134/840 - 360/840 = 1134 - 360/840 = 774/840
After reducing the fraction, the answer is 129/140

MathStep (Works offline)

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