Subtract 63/21 from 10/70
1st number: 10/70, 2nd number: 3 0/21
10/70 - 63/21 is -20/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
10/70 = 10 × 3/70 × 3 = 30/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
63/21 = 63 × 10/21 × 10 = 630/210 - Subtract the two like fractions:
30/210 - 630/210 = 30 - 630/210 = -600/210 - After reducing the fraction, the answer is -20/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/70-63/21 10/70-63/42 30/70-63/21 50/70-63/21