Subtract 90/70 from 35/40
1st number: 35/40, 2nd number: 1 20/70
35/40 - 90/70 is -23/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
35/40 = 35 × 7/40 × 7 = 245/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
90/70 = 90 × 4/70 × 4 = 360/280 - Subtract the two like fractions:
245/280 - 360/280 = 245 - 360/280 = -115/280 - After reducing the fraction, the answer is -23/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40-90/70 35/80-90/70