Subtract 25/70 from 21/6, Solve 3 3/6

Subtract 25/70 from 21/6

1^st number: 3 3/6, 2^nd number: 25/70

21/6 - 25/70 is 22/7.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 70 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 6 × 35 = 210,
21/6 = 21 × 35/6 × 35 = 735/210
Likewise, for the 2nd fraction, since 70 × 3 = 210,
25/70 = 25 × 3/70 × 3 = 75/210
Subtract the two like fractions:
735/210 - 75/210 = 735 - 75/210 = 660/210
After reducing the fraction, the answer is 22/7
In mixed form: 31/7

MathStep (Works offline)

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