Subtract 75/20 from 40/84
1st number: 40/84, 2nd number: 3 15/20
40/84 - 75/20 is -275/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
40/84 = 40 × 5/84 × 5 = 200/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
75/20 = 75 × 21/20 × 21 = 1575/420 - Subtract the two like fractions:
200/420 - 1575/420 = 200 - 1575/420 = -1375/420 - After reducing the fraction, the answer is -275/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-75/20 40/84-75/40 40/84-75/60