Subtract 45/72 from 10/20
10/20 - 45/72 is -1/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
10/20 = 10 × 18/20 × 18 = 180/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
45/72 = 45 × 5/72 × 5 = 225/360 - Subtract the two like fractions:
180/360 - 225/360 = 180 - 225/360 = -45/360 - After reducing the fraction, the answer is -1/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-90/72 10/40-45/72 30/20-45/72 10/60-45/72 50/20-45/72 70/20-45/72