Subtract 1/42 from 35/20, Solve 1 15/20

Subtract 1/42 from 35/20

1^st number: 1 15/20, 2^nd number: 1/42

35/20 - 1/42 is 145/84.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 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 42 × 10 = 420,
1/42 = 1 × 10/42 × 10 = 10/420
Subtract the two like fractions:
735/420 - 10/420 = 735 - 10/420 = 725/420
After reducing the fraction, the answer is 145/84
In mixed form: 161/84

MathStep (Works offline)

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