Subtract 15/7 from 20/45
1st number: 20/45, 2nd number: 2 1/7
20/45 - 15/7 is -107/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 7 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
20/45 = 20 × 7/45 × 7 = 140/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
15/7 = 15 × 45/7 × 45 = 675/315 - Subtract the two like fractions:
140/315 - 675/315 = 140 - 675/315 = -535/315 - After reducing the fraction, the answer is -107/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-15/7 20/45-30/7 20/90-15/7 20/45-15/14 60/45-15/7 20/45-45/7 20/45-15/21 20/45-75/7 20/45-15/35 20/45-15/49