Subtract 42/64 from 10/90, Solve 10/90

Subtract 42/64 from 10/90

10/90 - 42/64 is -157/288.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 64 is 2880

Next, find the equivalent fraction of both fractional numbers with denominator 2880
For the 1st fraction, since 90 × 32 = 2880,
10/90 = 10 × 32/90 × 32 = 320/2880
Likewise, for the 2nd fraction, since 64 × 45 = 2880,
42/64 = 42 × 45/64 × 45 = 1890/2880
Subtract the two like fractions:
320/2880 - 1890/2880 = 320 - 1890/2880 = -1570/2880
After reducing the fraction, the answer is -157/288

MathStep (Works offline)

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