Subtract 21/6 from 70/25, Solve 2 20/25

Subtract 21/6 from 70/25

1^st number: 2 20/25, 2^nd number: 3 3/6

70/25 - 21/6 is -7/10.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 6 is 150

Next, find the equivalent fraction of both fractional numbers with denominator 150
For the 1st fraction, since 25 × 6 = 150,
70/25 = 70 × 6/25 × 6 = 420/150
Likewise, for the 2nd fraction, since 6 × 25 = 150,
21/6 = 21 × 25/6 × 25 = 525/150
Subtract the two like fractions:
420/150 - 525/150 = 420 - 525/150 = -105/150
After reducing the fraction, the answer is -7/10

MathStep (Works offline)

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