Subtract 81/7 from 40/9
1st number: 4 4/9, 2nd number: 11 4/7
40/9 - 81/7 is -449/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 7 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
40/9 = 40 × 7/9 × 7 = 280/63 - Likewise, for the 2nd fraction, since 7 × 9 = 63,
81/7 = 81 × 9/7 × 9 = 729/63 - Subtract the two like fractions:
280/63 - 729/63 = 280 - 729/63 = -449/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-81/7 40/18-81/7 40/9-81/14 40/27-81/7 40/9-81/21 40/45-81/7 40/9-81/35 40/63-81/7 40/9-81/49