Subtract 75/6 from 21/70, Solve 21/70

Subtract 75/6 from 21/70

1^st number: 21/70, 2^nd number: 12 3/6

21/70 - 75/6 is -61/5.

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

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210
Likewise, for the 2nd fraction, since 6 × 35 = 210,
75/6 = 75 × 35/6 × 35 = 2625/210
Subtract the two like fractions:
63/210 - 2625/210 = 63 - 2625/210 = -2562/210
After reducing the fraction, the answer is -61/5

MathStep (Works offline)

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