Subtract 35/20 from 3/21
1st number: 3/21, 2nd number: 1 15/20
3/21 - 35/20 is -45/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
3/21 = 3 × 20/21 × 20 = 60/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
35/20 = 35 × 21/20 × 21 = 735/420 - Subtract the two like fractions:
60/420 - 735/420 = 60 - 735/420 = -675/420 - After reducing the fraction, the answer is -45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-35/20 3/21-70/20 3/42-35/20 3/21-35/40 9/21-35/20 3/63-35/20 3/21-35/60 15/21-35/20