Subtract 84/9 from 64/42, Solve 1 22/42

Subtract 84/9 from 64/42

1^st number: 1 22/42, 2^nd number: 9 3/9

64/42 - 84/9 is -164/21.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
64/42 = 64 × 3/42 × 3 = 192/126
Likewise, for the 2nd fraction, since 9 × 14 = 126,
84/9 = 84 × 14/9 × 14 = 1176/126
Subtract the two like fractions:
192/126 - 1176/126 = 192 - 1176/126 = -984/126
After reducing the fraction, the answer is -164/21

MathStep (Works offline)

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