Subtract 90/42 from 12/10, Solve 1 2/10

Subtract 90/42 from 12/10

1^st number: 1 2/10, 2^nd number: 2 6/42

12/10 - 90/42 is -33/35.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
90/42 = 90 × 5/42 × 5 = 450/210
Subtract the two like fractions:
252/210 - 450/210 = 252 - 450/210 = -198/210
After reducing the fraction, the answer is -33/35

MathStep (Works offline)

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