Subtract 1/40 from 1/7
1/7 - 1/40 is 33/280.
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,
1/7 = 1 × 40/7 × 40 = 40/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
1/40 = 1 × 7/40 × 7 = 7/280 - Subtract the two like fractions:
40/280 - 7/280 = 40 - 7/280 = 33/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/7-1/40 1/7-2/40 1/14-1/40 1/7-1/80 3/7-1/40 1/7-3/40 1/21-1/40 5/7-1/40 1/7-5/40 1/35-1/40 1/7-7/40 1/49-1/40