Subtract 5/42 from 98/40, Solve 2 18/40

Subtract 5/42 from 98/40

1^st number: 2 18/40, 2^nd number: 5/42

98/40 - 5/42 is 979/420.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
98/40 = 98 × 21/40 × 21 = 2058/840
Likewise, for the 2nd fraction, since 42 × 20 = 840,
5/42 = 5 × 20/42 × 20 = 100/840
Subtract the two like fractions:
2058/840 - 100/840 = 2058 - 100/840 = 1958/840
After reducing the fraction, the answer is 979/420
In mixed form: 2139/420

MathStep (Works offline)

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