Subtract 90/70 from 81/48, Solve 1 33/48

Subtract 90/70 from 81/48

1^st number: 1 33/48, 2^nd number: 1 20/70

81/48 - 90/70 is 45/112.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 70 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 48 × 35 = 1680,
81/48 = 81 × 35/48 × 35 = 2835/1680
Likewise, for the 2nd fraction, since 70 × 24 = 1680,
90/70 = 90 × 24/70 × 24 = 2160/1680
Subtract the two like fractions:
2835/1680 - 2160/1680 = 2835 - 2160/1680 = 675/1680
After reducing the fraction, the answer is 45/112

MathStep (Works offline)

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