Subtract 40/56 from 42/45
42/45 - 40/56 is 23/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 56 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 45 × 56 = 2520,
42/45 = 42 × 56/45 × 56 = 2352/2520 - Likewise, for the 2nd fraction, since 56 × 45 = 2520,
40/56 = 40 × 45/56 × 45 = 1800/2520 - Subtract the two like fractions:
2352/2520 - 1800/2520 = 2352 - 1800/2520 = 552/2520 - After reducing the fraction, the answer is 23/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-40/56 42/45-80/56 42/90-40/56