Subtract 70/15 from 90/8
1st number: 11 2/8, 2nd number: 4 10/15
90/8 - 70/15 is 79/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
90/8 = 90 × 15/8 × 15 = 1350/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
70/15 = 70 × 8/15 × 8 = 560/120 - Subtract the two like fractions:
1350/120 - 560/120 = 1350 - 560/120 = 790/120 - After reducing the fraction, the answer is 79/12
- In mixed form: 67/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/16-70/15 90/8-70/30 90/24-70/15 90/8-70/45 90/40-70/15 90/8-70/75 90/56-70/15