Subtract 3/7 from 8/40
8/40 - 3/7 is -8/35.
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,
8/40 = 8 × 7/40 × 7 = 56/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
3/7 = 3 × 40/7 × 40 = 120/280 - Subtract the two like fractions:
56/280 - 120/280 = 56 - 120/280 = -64/280 - After reducing the fraction, the answer is -8/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/40-3/7 8/40-6/7 8/80-3/7 8/40-3/14 24/40-3/7 8/40-9/7 8/40-3/21 8/40-15/7 8/40-3/35 56/40-3/7 8/40-21/7 8/40-3/49