Subtract 70/20 from 9/7
1st number: 1 2/7, 2nd number: 3 10/20
9/7 - 70/20 is -31/14.
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,
9/7 = 9 × 20/7 × 20 = 180/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
70/20 = 70 × 7/20 × 7 = 490/140 - Subtract the two like fractions:
180/140 - 490/140 = 180 - 490/140 = -310/140 - After reducing the fraction, the answer is -31/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/7-70/20 9/14-70/20 9/7-70/40 27/7-70/20 9/21-70/20 9/7-70/60 45/7-70/20 9/35-70/20 63/7-70/20 9/49-70/20