Subtract 63/9 from 70/21
1st number: 3 7/21, 2nd number: 7 0/9
70/21 - 63/9 is -11/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
70/21 = 70 × 3/21 × 3 = 210/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
63/9 = 63 × 7/9 × 7 = 441/63 - Subtract the two like fractions:
210/63 - 441/63 = 210 - 441/63 = -231/63 - After reducing the fraction, the answer is -11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-63/9 70/21-63/18 70/63-63/9 70/21-63/27 70/21-63/45