Subtract 7/64 from 21/6, Solve 3 3/6

Subtract 7/64 from 21/6

1^st number: 3 3/6, 2^nd number: 7/64

21/6 - 7/64 is 217/64.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 64 is 192

Next, find the equivalent fraction of both fractional numbers with denominator 192
For the 1st fraction, since 6 × 32 = 192,
21/6 = 21 × 32/6 × 32 = 672/192
Likewise, for the 2nd fraction, since 64 × 3 = 192,
7/64 = 7 × 3/64 × 3 = 21/192
Subtract the two like fractions:
672/192 - 21/192 = 672 - 21/192 = 651/192
After reducing the fraction, the answer is 217/64
In mixed form: 325/64

MathStep (Works offline)

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