Subtract 84/30 from 8/42, Solve 8/42

Subtract 84/30 from 8/42

1^st number: 8/42, 2^nd number: 2 24/30

8/42 - 84/30 is -274/105.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
8/42 = 8 × 5/42 × 5 = 40/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
84/30 = 84 × 7/30 × 7 = 588/210
Subtract the two like fractions:
40/210 - 588/210 = 40 - 588/210 = -548/210
After reducing the fraction, the answer is -274/105

MathStep (Works offline)

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