Subtract 1/72 from 21/35
21/35 - 1/72 is 211/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 35 × 72 = 2520,
21/35 = 21 × 72/35 × 72 = 1512/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
1/72 = 1 × 35/72 × 35 = 35/2520 - Subtract the two like fractions:
1512/2520 - 35/2520 = 1512 - 35/2520 = 1477/2520 - After reducing the fraction, the answer is 211/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-1/72 21/35-2/72 21/70-1/72 63/35-1/72 21/35-3/72 21/35-5/72 21/35-7/72