Subtract 45/56 from 70/72
70/72 - 45/56 is 85/504.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
70/72 = 70 × 7/72 × 7 = 490/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
45/56 = 45 × 9/56 × 9 = 405/504 - Subtract the two like fractions:
490/504 - 405/504 = 490 - 405/504 = 85/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/72-90/56