Subtract 20/7 from 12/45
1st number: 12/45, 2nd number: 2 6/7
12/45 - 20/7 is -272/105.
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,
12/45 = 12 × 7/45 × 7 = 84/315 - Likewise, for the 2nd fraction, since 7 × 45 = 315,
20/7 = 20 × 45/7 × 45 = 900/315 - Subtract the two like fractions:
84/315 - 900/315 = 84 - 900/315 = -816/315 - After reducing the fraction, the answer is -272/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/45-20/7 12/45-40/7 12/90-20/7 12/45-20/14 36/45-20/7 12/45-60/7 12/45-20/21 60/45-20/7 12/45-20/35 84/45-20/7 12/45-20/49