Subtract 30/7 from 81/70
1st number: 1 11/70, 2nd number: 4 2/7
81/70 - 30/7 is -219/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
81/70 = 81 × 1/70 × 1 = 81/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
30/7 = 30 × 10/7 × 10 = 300/70 - Subtract the two like fractions:
81/70 - 300/70 = 81 - 300/70 = -219/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70-60/7 81/70-30/14 81/70-90/7 81/70-30/21 81/70-30/35 81/70-30/49