Subtract 90/70 from 9/8
1st number: 1 1/8, 2nd number: 1 20/70
9/8 - 90/70 is -9/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 8 × 35 = 280,
9/8 = 9 × 35/8 × 35 = 315/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
90/70 = 90 × 4/70 × 4 = 360/280 - Subtract the two like fractions:
315/280 - 360/280 = 315 - 360/280 = -45/280 - After reducing the fraction, the answer is -9/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/8-90/70 9/16-90/70 27/8-90/70 9/24-90/70 45/8-90/70 9/40-90/70 63/8-90/70 9/56-90/70