Subtract 21/30 from 72/98
72/98 - 21/30 is 17/490.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 98 and 30 is 1470
Next, find the equivalent fraction of both fractional numbers with denominator 1470 - For the 1st fraction, since 98 × 15 = 1470,
72/98 = 72 × 15/98 × 15 = 1080/1470 - Likewise, for the 2nd fraction, since 30 × 49 = 1470,
21/30 = 21 × 49/30 × 49 = 1029/1470 - Subtract the two like fractions:
1080/1470 - 1029/1470 = 1080 - 1029/1470 = 51/1470 - After reducing the fraction, the answer is 17/490
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/98-42/30 72/98-21/60 72/98-63/30 72/98-21/90