Subtract 30/40 from 81/7
1st number: 11 4/7, 2nd number: 30/40
81/7 - 30/40 is 303/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
81/7 = 81 × 40/7 × 40 = 3240/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
30/40 = 30 × 7/40 × 7 = 210/280 - Subtract the two like fractions:
3240/280 - 210/280 = 3240 - 210/280 = 3030/280 - After reducing the fraction, the answer is 303/28
- In mixed form: 1023/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/7-60/40 81/14-30/40 81/7-30/80 81/7-90/40 81/21-30/40 81/35-30/40 81/49-30/40