Subtract 90/7 from 30/42
1st number: 30/42, 2nd number: 12 6/7
30/42 - 90/7 is -85/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
30/42 = 30 × 1/42 × 1 = 30/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
90/7 = 90 × 6/7 × 6 = 540/42 - Subtract the two like fractions:
30/42 - 540/42 = 30 - 540/42 = -510/42 - After reducing the fraction, the answer is -85/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-90/7 30/84-90/7 30/42-90/14 90/42-90/7 30/42-90/21 30/42-90/35 30/42-90/49