Subtract 9/7 from 12/40
1st number: 12/40, 2nd number: 1 2/7
12/40 - 9/7 is -69/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
12/40 = 12 × 7/40 × 7 = 84/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
9/7 = 9 × 40/7 × 40 = 360/280 - Subtract the two like fractions:
84/280 - 360/280 = 84 - 360/280 = -276/280 - After reducing the fraction, the answer is -69/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40-9/7 12/40-18/7 12/80-9/7 12/40-9/14 36/40-9/7 12/40-27/7 12/40-9/21 60/40-9/7 12/40-45/7 12/40-9/35 84/40-9/7 12/40-63/7 12/40-9/49