Subtract 70/63 from 21/35
1st number: 21/35, 2nd number: 1 7/63
21/35 - 70/63 is -23/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 35 × 9 = 315,
21/35 = 21 × 9/35 × 9 = 189/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
70/63 = 70 × 5/63 × 5 = 350/315 - Subtract the two like fractions:
189/315 - 350/315 = 189 - 350/315 = -161/315 - After reducing the fraction, the answer is -23/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35-70/63 21/70-70/63 63/35-70/63