Subtract 80/42 from 60/9, Solve 6 6/9

Subtract 80/42 from 60/9

1^st number: 6 6/9, 2^nd number: 1 38/42

60/9 - 80/42 is 100/21.

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

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 9 × 14 = 126,
60/9 = 60 × 14/9 × 14 = 840/126
Likewise, for the 2nd fraction, since 42 × 3 = 126,
80/42 = 80 × 3/42 × 3 = 240/126
Subtract the two like fractions:
840/126 - 240/126 = 840 - 240/126 = 600/126
After reducing the fraction, the answer is 100/21
In mixed form: 416/21

MathStep (Works offline)

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