Subtract 42/15 from 10/84, Solve 10/84

Subtract 42/15 from 10/84

1^st number: 10/84, 2^nd number: 2 12/15

10/84 - 42/15 is -563/210.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 84 × 5 = 420,
10/84 = 10 × 5/84 × 5 = 50/420
Likewise, for the 2nd fraction, since 15 × 28 = 420,
42/15 = 42 × 28/15 × 28 = 1176/420
Subtract the two like fractions:
50/420 - 1176/420 = 50 - 1176/420 = -1126/420
After reducing the fraction, the answer is -563/210

MathStep (Works offline)

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