Subtract 3/84 from 35/20, Solve 1 15/20

Subtract 3/84 from 35/20

1^st number: 1 15/20, 2^nd number: 3/84

35/20 - 3/84 is 12/7.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
35/20 = 35 × 21/20 × 21 = 735/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420
Subtract the two like fractions:
735/420 - 15/420 = 735 - 15/420 = 720/420
After reducing the fraction, the answer is 12/7
In mixed form: 15/7

MathStep (Works offline)

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