Subtract 21/32 from 49/81
49/81 - 21/32 is -133/2592.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 32 is 2592
Next, find the equivalent fraction of both fractional numbers with denominator 2592 - For the 1st fraction, since 81 × 32 = 2592,
49/81 = 49 × 32/81 × 32 = 1568/2592 - Likewise, for the 2nd fraction, since 32 × 81 = 2592,
21/32 = 21 × 81/32 × 81 = 1701/2592 - Subtract the two like fractions:
1568/2592 - 1701/2592 = 1568 - 1701/2592 = -133/2592
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/81-21/32 49/81-42/32 49/81-21/64 49/81-63/32 49/81-21/96