Subtract 18/21 from 81/32
1st number: 2 17/32, 2nd number: 18/21
81/32 - 18/21 is 375/224.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 32 and 21 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 32 × 21 = 672,
81/32 = 81 × 21/32 × 21 = 1701/672 - Likewise, for the 2nd fraction, since 21 × 32 = 672,
18/21 = 18 × 32/21 × 32 = 576/672 - Subtract the two like fractions:
1701/672 - 576/672 = 1701 - 576/672 = 1125/672 - After reducing the fraction, the answer is 375/224
- In mixed form: 1151/224
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/32-36/21 81/64-18/21 81/32-18/42 81/32-54/21 81/96-18/21 81/32-18/63 81/32-90/21