Subtract 12/42 from 98/18, Solve 5 8/18

Subtract 12/42 from 98/18

1^st number: 5 8/18, 2^nd number: 12/42

98/18 - 12/42 is 325/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
98/18 = 98 × 7/18 × 7 = 686/126
Likewise, for the 2nd fraction, since 42 × 3 = 126,
12/42 = 12 × 3/42 × 3 = 36/126
Subtract the two like fractions:
686/126 - 36/126 = 686 - 36/126 = 650/126
After reducing the fraction, the answer is 325/63
In mixed form: 510/63

MathStep (Works offline)

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