Subtract 42/72 from 90/96
90/96 - 42/72 is 17/48.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 96 and 72 is 288
Next, find the equivalent fraction of both fractional numbers with denominator 288 - For the 1st fraction, since 96 × 3 = 288,
90/96 = 90 × 3/96 × 3 = 270/288 - Likewise, for the 2nd fraction, since 72 × 4 = 288,
42/72 = 42 × 4/72 × 4 = 168/288 - Subtract the two like fractions:
270/288 - 168/288 = 270 - 168/288 = 102/288 - After reducing the fraction, the answer is 17/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/96-84/72