Subtract 20/72 from 2/28
2/28 - 20/72 is -13/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 28 × 18 = 504,
2/28 = 2 × 18/28 × 18 = 36/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Subtract the two like fractions:
36/504 - 140/504 = 36 - 140/504 = -104/504 - After reducing the fraction, the answer is -13/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/28-20/72 2/28-40/72 2/56-20/72 6/28-20/72 2/28-60/72 2/84-20/72 10/28-20/72 14/28-20/72