Subtract 3/21 from 98/40, Solve 2 18/40

Subtract 3/21 from 98/40

1^st number: 2 18/40, 2^nd number: 3/21

98/40 - 3/21 is 323/140.

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,
98/40 = 98 × 21/40 × 21 = 2058/840
Likewise, for the 2nd fraction, since 21 × 40 = 840,
3/21 = 3 × 40/21 × 40 = 120/840
Subtract the two like fractions:
2058/840 - 120/840 = 2058 - 120/840 = 1938/840
After reducing the fraction, the answer is 323/140
In mixed form: 243/140

MathStep (Works offline)

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