Subtract 90/48 from 3/70, Solve 3/70

Subtract 90/48 from 3/70

1^st number: 3/70, 2^nd number: 1 42/48

3/70 - 90/48 is -513/280.

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

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 70 × 24 = 1680,
3/70 = 3 × 24/70 × 24 = 72/1680
Likewise, for the 2nd fraction, since 48 × 35 = 1680,
90/48 = 90 × 35/48 × 35 = 3150/1680
Subtract the two like fractions:
72/1680 - 3150/1680 = 72 - 3150/1680 = -3078/1680
After reducing the fraction, the answer is -513/280

MathStep (Works offline)

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