Subtract 70/14 from 21/42
1st number: 21/42, 2nd number: 5 0/14
21/42 - 70/14 is -9/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
70/14 = 70 × 3/14 × 3 = 210/42 - Subtract the two like fractions:
21/42 - 210/42 = 21 - 210/42 = -189/42 - After reducing the fraction, the answer is -9/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/84-70/14 21/42-70/28 63/42-70/14 21/42-70/42 21/42-70/98