Subtract 3/15 from 40/84
40/84 - 3/15 is 29/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 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 15 × 28 = 420,
3/15 = 3 × 28/15 × 28 = 84/420 - Subtract the two like fractions:
200/420 - 84/420 = 200 - 84/420 = 116/420 - After reducing the fraction, the answer is 29/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-3/15 40/84-6/15 40/84-3/30 40/84-9/15 40/84-3/45 40/84-3/75 40/84-21/15