Subtract 20/6 from 42/35, Solve 1 7/35

Subtract 20/6 from 42/35

1^st number: 1 7/35, 2^nd number: 3 2/6

42/35 - 20/6 is -32/15.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 6 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 35 × 6 = 210,
42/35 = 42 × 6/35 × 6 = 252/210
Likewise, for the 2nd fraction, since 6 × 35 = 210,
20/6 = 20 × 35/6 × 35 = 700/210
Subtract the two like fractions:
252/210 - 700/210 = 252 - 700/210 = -448/210
After reducing the fraction, the answer is -32/15

MathStep (Works offline)

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