Subtract 70/7 from 70/20
1st number: 3 10/20, 2nd number: 10 0/7
70/20 - 70/7 is -13/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
70/20 = 70 × 7/20 × 7 = 490/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
70/7 = 70 × 20/7 × 20 = 1400/140 - Subtract the two like fractions:
490/140 - 1400/140 = 490 - 1400/140 = -910/140 - After reducing the fraction, the answer is -13/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40-70/7 70/20-70/14 70/60-70/7 70/20-70/21 70/20-70/35 70/20-70/49