Subtract 1/24 from 21/70
21/70 - 1/24 is 31/120.
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,
21/70 = 21 × 12/70 × 12 = 252/840 - Likewise, for the 2nd fraction, since 24 × 35 = 840,
1/24 = 1 × 35/24 × 35 = 35/840 - Subtract the two like fractions:
252/840 - 35/840 = 252 - 35/840 = 217/840 - After reducing the fraction, the answer is 31/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-1/24 21/70-2/24 21/70-1/48 63/70-1/24 21/70-3/24 21/70-1/72 21/70-5/24 21/70-7/24