Subtract 7/5 from 12/21
1st number: 12/21, 2nd number: 1 2/5
12/21 - 7/5 is -29/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
7/5 = 7 × 21/5 × 21 = 147/105 - Subtract the two like fractions:
60/105 - 147/105 = 60 - 147/105 = -87/105 - After reducing the fraction, the answer is -29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-7/5 12/21-14/5 12/42-7/5 12/21-7/10 36/21-7/5 12/21-21/5 12/63-7/5 12/21-7/15 60/21-7/5 12/21-35/5 12/21-7/25 84/21-7/5 12/21-49/5 12/21-7/35