Subtract 20/15 from 2/21
1st number: 2/21, 2nd number: 1 5/15
2/21 - 20/15 is -26/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
2/21 = 2 × 5/21 × 5 = 10/105 - Likewise, for the 2nd fraction, since 15 × 7 = 105,
20/15 = 20 × 7/15 × 7 = 140/105 - Subtract the two like fractions:
10/105 - 140/105 = 10 - 140/105 = -130/105 - After reducing the fraction, the answer is -26/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-20/15 2/21-40/15 2/42-20/15 2/21-20/30 6/21-20/15 2/21-60/15 2/63-20/15 2/21-20/45 10/21-20/15 2/21-20/75 14/21-20/15