Subtract 70/20 from 3/7
1st number: 3/7, 2nd number: 3 10/20
3/7 - 70/20 is -43/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
3/7 = 3 × 20/7 × 20 = 60/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
70/20 = 70 × 7/20 × 7 = 490/140 - Subtract the two like fractions:
60/140 - 490/140 = 60 - 490/140 = -430/140 - After reducing the fraction, the answer is -43/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-70/20 3/14-70/20 3/7-70/40 9/7-70/20 3/21-70/20 3/7-70/60 15/7-70/20 3/35-70/20 21/7-70/20 3/49-70/20