Subtract 84/72 from 90/80
1st number: 1 10/80, 2nd number: 1 12/72
90/80 - 84/72 is -1/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 72 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
90/80 = 90 × 9/80 × 9 = 810/720 - Likewise, for the 2nd fraction, since 72 × 10 = 720,
84/72 = 84 × 10/72 × 10 = 840/720 - Subtract the two like fractions:
810/720 - 840/720 = 810 - 840/720 = -30/720 - After reducing the fraction, the answer is -1/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: