Subtract 81/70 from 4/40
1st number: 4/40, 2nd number: 1 11/70
4/40 - 81/70 is -37/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
4/40 = 4 × 7/40 × 7 = 28/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
81/70 = 81 × 4/70 × 4 = 324/280 - Subtract the two like fractions:
28/280 - 324/280 = 28 - 324/280 = -296/280 - After reducing the fraction, the answer is -37/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/40-81/70 4/80-81/70 12/40-81/70 20/40-81/70 28/40-81/70