Subtract 21/64 from 56/42, Solve 1 14/42

Subtract 21/64 from 56/42

1^st number: 1 14/42, 2^nd number: 21/64

56/42 - 21/64 is 193/192.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 64 is 1344

Next, find the equivalent fraction of both fractional numbers with denominator 1344
For the 1st fraction, since 42 × 32 = 1344,
56/42 = 56 × 32/42 × 32 = 1792/1344
Likewise, for the 2nd fraction, since 64 × 21 = 1344,
21/64 = 21 × 21/64 × 21 = 441/1344
Subtract the two like fractions:
1792/1344 - 441/1344 = 1792 - 441/1344 = 1351/1344
After reducing the fraction, the answer is 193/192
In mixed form: 11/192

MathStep (Works offline)

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