Subtract 90/7 from 40/4
1st number: 10 0/4, 2nd number: 12 6/7
40/4 - 90/7 is -20/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 4 × 7 = 28,
40/4 = 40 × 7/4 × 7 = 280/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
90/7 = 90 × 4/7 × 4 = 360/28 - Subtract the two like fractions:
280/28 - 360/28 = 280 - 360/28 = -80/28 - After reducing the fraction, the answer is -20/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/4-90/7 40/8-90/7 40/4-90/14 40/12-90/7 40/4-90/21 40/20-90/7 40/4-90/35 40/28-90/7 40/4-90/49