Subtract 21/45 from 3/56
3/56 - 21/45 is -347/840.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 45 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
3/56 = 3 × 45/56 × 45 = 135/2520 - Likewise, for the 2nd fraction, since 45 × 56 = 2520,
21/45 = 21 × 56/45 × 56 = 1176/2520 - Subtract the two like fractions:
135/2520 - 1176/2520 = 135 - 1176/2520 = -1041/2520 - After reducing the fraction, the answer is -347/840
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/56-21/45 3/56-42/45 3/56-21/90 9/56-21/45 3/56-63/45 15/56-21/45 21/56-21/45