Subtract 30/72 from 3/28
3/28 - 30/72 is -13/42.
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,
3/28 = 3 × 18/28 × 18 = 54/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
30/72 = 30 × 7/72 × 7 = 210/504 - Subtract the two like fractions:
54/504 - 210/504 = 54 - 210/504 = -156/504 - After reducing the fraction, the answer is -13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/28-30/72 3/28-60/72 3/56-30/72 9/28-30/72 3/28-90/72 3/84-30/72 15/28-30/72 21/28-30/72