Subtract 20/36 from 2/7
2/7 - 20/36 is -17/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 7 × 36 = 252,
2/7 = 2 × 36/7 × 36 = 72/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
20/36 = 20 × 7/36 × 7 = 140/252 - Subtract the two like fractions:
72/252 - 140/252 = 72 - 140/252 = -68/252 - After reducing the fraction, the answer is -17/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/7-20/36 2/7-40/36 2/14-20/36 2/7-20/72 6/7-20/36 2/7-60/36 2/21-20/36 10/7-20/36 2/35-20/36 14/7-20/36 2/49-20/36