Subtract 54/21 from 2/18, Solve 2/18

Subtract 54/21 from 2/18

1^st number: 2/18, 2^nd number: 2 12/21

2/18 - 54/21 is -155/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
2/18 = 2 × 7/18 × 7 = 14/126
Likewise, for the 2nd fraction, since 21 × 6 = 126,
54/21 = 54 × 6/21 × 6 = 324/126
Subtract the two like fractions:
14/126 - 324/126 = 14 - 324/126 = -310/126
After reducing the fraction, the answer is -155/63

MathStep (Works offline)

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