Subtract 90/35 from 80/40
1st number: 2 0/40, 2nd number: 2 20/35
80/40 - 90/35 is -4/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 35 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
80/40 = 80 × 7/40 × 7 = 560/280 - Likewise, for the 2nd fraction, since 35 × 8 = 280,
90/35 = 90 × 8/35 × 8 = 720/280 - Subtract the two like fractions:
560/280 - 720/280 = 560 - 720/280 = -160/280 - After reducing the fraction, the answer is -4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/40-90/70