Subtract 21/24 from 35/70
35/70 - 21/24 is -3/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 24 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 70 × 12 = 840,
35/70 = 35 × 12/70 × 12 = 420/840 - Likewise, for the 2nd fraction, since 24 × 35 = 840,
21/24 = 21 × 35/24 × 35 = 735/840 - Subtract the two like fractions:
420/840 - 735/840 = 420 - 735/840 = -315/840 - After reducing the fraction, the answer is -3/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 35/70-42/24 35/70-21/48 35/70-63/24 35/70-21/72