Subtract 9/8 from 80/90
1st number: 80/90, 2nd number: 1 1/8
80/90 - 9/8 is -17/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
80/90 = 80 × 4/90 × 4 = 320/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
9/8 = 9 × 45/8 × 45 = 405/360 - Subtract the two like fractions:
320/360 - 405/360 = 320 - 405/360 = -85/360 - After reducing the fraction, the answer is -17/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-18/8 80/90-9/16 80/90-27/8 80/90-9/24 80/90-45/8 80/90-9/40 80/90-63/8 80/90-9/56