Subtract 24/21 from 40/30, Solve 1 10/30

Subtract 24/21 from 40/30

1^st number: 1 10/30, 2^nd number: 1 3/21

40/30 - 24/21 is 4/21.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
40/30 = 40 × 7/30 × 7 = 280/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
24/21 = 24 × 10/21 × 10 = 240/210
Subtract the two like fractions:
280/210 - 240/210 = 280 - 240/210 = 40/210
After reducing the fraction, the answer is 4/21

MathStep (Works offline)

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