Subtract 7/21 from 35/30, Solve 1 5/30

Subtract 7/21 from 35/30

1^st number: 1 5/30, 2^nd number: 7/21

35/30 - 7/21 is 5/6.

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,
35/30 = 35 × 7/30 × 7 = 245/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210
Subtract the two like fractions:
245/210 - 70/210 = 245 - 70/210 = 175/210
After reducing the fraction, the answer is 5/6

MathStep (Works offline)

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