Subtract 35/8 from 21/81
1st number: 21/81, 2nd number: 4 3/8
21/81 - 35/8 is -889/216.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
21/81 = 21 × 8/81 × 8 = 168/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
35/8 = 35 × 81/8 × 81 = 2835/648 - Subtract the two like fractions:
168/648 - 2835/648 = 168 - 2835/648 = -2667/648 - After reducing the fraction, the answer is -889/216
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81-35/8 21/81-70/8 21/81-35/16 63/81-35/8 21/81-35/24 21/81-35/40 21/81-35/56