Subtract 42/64 from 72/84
72/84 - 42/64 is 45/224.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 64 is 1344
Next, find the equivalent fraction of both fractional numbers with denominator 1344 - For the 1st fraction, since 84 × 16 = 1344,
72/84 = 72 × 16/84 × 16 = 1152/1344 - Likewise, for the 2nd fraction, since 64 × 21 = 1344,
42/64 = 42 × 21/64 × 21 = 882/1344 - Subtract the two like fractions:
1152/1344 - 882/1344 = 1152 - 882/1344 = 270/1344 - After reducing the fraction, the answer is 45/224
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/84-84/64