Subtract 20/40 from 8/7
1st number: 1 1/7, 2nd number: 20/40
8/7 - 20/40 is 9/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
8/7 = 8 × 40/7 × 40 = 320/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
20/40 = 20 × 7/40 × 7 = 140/280 - Subtract the two like fractions:
320/280 - 140/280 = 320 - 140/280 = 180/280 - After reducing the fraction, the answer is 9/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-20/40 8/14-20/40 8/7-20/80 24/7-20/40 8/7-60/40 8/21-20/40 40/7-20/40 8/35-20/40 56/7-20/40 8/49-20/40