Subtract 30/80 from 56/42, Solve 1 14/42

Subtract 30/80 from 56/42

1^st number: 1 14/42, 2^nd number: 30/80

56/42 - 30/80 is 23/24.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 42 × 40 = 1680,
56/42 = 56 × 40/42 × 40 = 2240/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
30/80 = 30 × 21/80 × 21 = 630/1680
Subtract the two like fractions:
2240/1680 - 630/1680 = 2240 - 630/1680 = 1610/1680
After reducing the fraction, the answer is 23/24

MathStep (Works offline)

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