Subtract 90/70 from 8/72
1st number: 8/72, 2nd number: 1 20/70
8/72 - 90/70 is -74/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
8/72 = 8 × 35/72 × 35 = 280/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
90/70 = 90 × 36/70 × 36 = 3240/2520 - Subtract the two like fractions:
280/2520 - 3240/2520 = 280 - 3240/2520 = -2960/2520 - After reducing the fraction, the answer is -74/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/72-90/70 24/72-90/70 40/72-90/70 56/72-90/70