Subtract 90/70 from 36/80
1st number: 36/80, 2nd number: 1 20/70
36/80 - 90/70 is -117/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
36/80 = 36 × 7/80 × 7 = 252/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
90/70 = 90 × 8/70 × 8 = 720/560 - Subtract the two like fractions:
252/560 - 720/560 = 252 - 720/560 = -468/560 - After reducing the fraction, the answer is -117/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80-90/70