Subtract 21/60 from 12/9, Solve 1 3/9

Subtract 21/60 from 12/9

1^st number: 1 3/9, 2^nd number: 21/60

12/9 - 21/60 is 59/60.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 60 is 180

Next, find the equivalent fraction of both fractional numbers with denominator 180
For the 1st fraction, since 9 × 20 = 180,
12/9 = 12 × 20/9 × 20 = 240/180
Likewise, for the 2nd fraction, since 60 × 3 = 180,
21/60 = 21 × 3/60 × 3 = 63/180
Subtract the two like fractions:
240/180 - 63/180 = 240 - 63/180 = 177/180
After reducing the fraction, the answer is 59/60

MathStep (Works offline)

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