Subtract 70/84 from 12/15
12/15 - 70/84 is -1/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
12/15 = 12 × 28/15 × 28 = 336/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
70/84 = 70 × 5/84 × 5 = 350/420 - Subtract the two like fractions:
336/420 - 350/420 = 336 - 350/420 = -14/420 - After reducing the fraction, the answer is -1/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-70/84 12/30-70/84 36/15-70/84 12/45-70/84 60/15-70/84 12/75-70/84 84/15-70/84