Subtract 90/40 from 4/5
1st number: 4/5, 2nd number: 2 10/40
4/5 - 90/40 is -29/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
4/5 = 4 × 8/5 × 8 = 32/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
90/40 = 90 × 1/40 × 1 = 90/40 - Subtract the two like fractions:
32/40 - 90/40 = 32 - 90/40 = -58/40 - After reducing the fraction, the answer is -29/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5-90/40 4/10-90/40 4/5-90/80 12/5-90/40 4/15-90/40 20/5-90/40 4/25-90/40 28/5-90/40 4/35-90/40