Subtract 90/72 from 8/10
1st number: 8/10, 2nd number: 1 18/72
8/10 - 90/72 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 10 × 36 = 360,
8/10 = 8 × 36/10 × 36 = 288/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
90/72 = 90 × 5/72 × 5 = 450/360 - Subtract the two like fractions:
288/360 - 450/360 = 288 - 450/360 = -162/360 - After reducing the fraction, the answer is -9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/10-90/72 8/20-90/72 24/10-90/72 8/30-90/72 40/10-90/72 8/50-90/72 56/10-90/72 8/70-90/72