Subtract 7/45 from 10/20
10/20 - 7/45 is 31/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
10/20 = 10 × 9/20 × 9 = 90/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Subtract the two like fractions:
90/180 - 28/180 = 90 - 28/180 = 62/180 - After reducing the fraction, the answer is 31/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-14/45 10/40-7/45 10/20-7/90 30/20-7/45 10/20-21/45 10/60-7/45 50/20-7/45 10/20-35/45 70/20-7/45 10/20-49/45