Subtract 15/64 from 7/42
7/42 - 15/64 is -13/192.
Steps for subtracting fractions
- 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,
7/42 = 7 × 32/42 × 32 = 224/1344 - Likewise, for the 2nd fraction, since 64 × 21 = 1344,
15/64 = 15 × 21/64 × 21 = 315/1344 - Subtract the two like fractions:
224/1344 - 315/1344 = 224 - 315/1344 = -91/1344 - After reducing the fraction, the answer is -13/192
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-15/64 7/42-30/64 7/84-15/64 21/42-15/64 7/42-45/64 35/42-15/64 7/42-75/64 49/42-15/64