Subtract 1/80 from 21/6, Solve 3 3/6

Subtract 1/80 from 21/6

1^st number: 3 3/6, 2^nd number: 1/80

21/6 - 1/80 is 279/80.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 80 is 240

Next, find the equivalent fraction of both fractional numbers with denominator 240
For the 1st fraction, since 6 × 40 = 240,
21/6 = 21 × 40/6 × 40 = 840/240
Likewise, for the 2nd fraction, since 80 × 3 = 240,
1/80 = 1 × 3/80 × 3 = 3/240
Subtract the two like fractions:
840/240 - 3/240 = 840 - 3/240 = 837/240
After reducing the fraction, the answer is 279/80
In mixed form: 339/80

MathStep (Works offline)

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