Subtract 70/42 from 6/21
1st number: 6/21, 2nd number: 1 28/42
6/21 - 70/42 is -29/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
6/21 = 6 × 2/21 × 2 = 12/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
70/42 = 70 × 1/42 × 1 = 70/42 - Subtract the two like fractions:
12/42 - 70/42 = 12 - 70/42 = -58/42 - After reducing the fraction, the answer is -29/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-70/42 6/42-70/42 6/21-70/84 18/21-70/42 6/63-70/42 30/21-70/42 42/21-70/42