Subtract 30/42 from 56/20, Solve 2 16/20

Subtract 30/42 from 56/20

1^st number: 2 16/20, 2^nd number: 30/42

56/20 - 30/42 is 73/35.

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,
56/20 = 56 × 21/20 × 21 = 1176/420
Likewise, for the 2nd fraction, since 42 × 10 = 420,
30/42 = 30 × 10/42 × 10 = 300/420
Subtract the two like fractions:
1176/420 - 300/420 = 1176 - 300/420 = 876/420
After reducing the fraction, the answer is 73/35
In mixed form: 23/35

MathStep (Works offline)

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