Subtract 30/25 from 6/21, Solve 6/21

Subtract 30/25 from 6/21

1^st number: 6/21, 2^nd number: 1 5/25

6/21 - 30/25 is -32/35.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525

Next, find the equivalent fraction of both fractional numbers with denominator 525
For the 1st fraction, since 21 × 25 = 525,
6/21 = 6 × 25/21 × 25 = 150/525
Likewise, for the 2nd fraction, since 25 × 21 = 525,
30/25 = 30 × 21/25 × 21 = 630/525
Subtract the two like fractions:
150/525 - 630/525 = 150 - 630/525 = -480/525
After reducing the fraction, the answer is -32/35

MathStep (Works offline)

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