Subtract 21/35 from 12/21
12/21 - 21/35 is -1/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 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 35 × 3 = 105,
21/35 = 21 × 3/35 × 3 = 63/105 - Subtract the two like fractions:
60/105 - 63/105 = 60 - 63/105 = -3/105 - After reducing the fraction, the answer is -1/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-21/35 12/21-42/35 12/42-21/35 12/21-21/70 36/21-21/35 12/21-63/35 12/63-21/35 60/21-21/35 84/21-21/35