Subtract 12/18 from 54/7, Solve 7 5/7

Subtract 12/18 from 54/7

1^st number: 7 5/7, 2^nd number: 12/18

54/7 - 12/18 is 148/21.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 7 × 18 = 126,
54/7 = 54 × 18/7 × 18 = 972/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126
Subtract the two like fractions:
972/126 - 84/126 = 972 - 84/126 = 888/126
After reducing the fraction, the answer is 148/21
In mixed form: 71/21

MathStep (Works offline)

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