Subtract 3/15 from 42/56
42/56 - 3/15 is 11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 15 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
42/56 = 42 × 15/56 × 15 = 630/840 - Likewise, for the 2nd fraction, since 15 × 56 = 840,
3/15 = 3 × 56/15 × 56 = 168/840 - Subtract the two like fractions:
630/840 - 168/840 = 630 - 168/840 = 462/840 - After reducing the fraction, the answer is 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56-3/15 42/56-6/15 42/56-3/30 42/56-9/15 42/56-3/45 42/56-3/75 42/56-21/15