Subtract 70/24 from 21/42
1st number: 21/42, 2nd number: 2 22/24
21/42 - 70/24 is -29/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
21/42 = 21 × 4/42 × 4 = 84/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
70/24 = 70 × 7/24 × 7 = 490/168 - Subtract the two like fractions:
84/168 - 490/168 = 84 - 490/168 = -406/168 - After reducing the fraction, the answer is -29/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84-70/24 21/42-70/48 63/42-70/24 21/42-70/72