Subtract 70/80 from 12/15
12/15 - 70/80 is -3/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
12/15 = 12 × 16/15 × 16 = 192/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
70/80 = 70 × 3/80 × 3 = 210/240 - Subtract the two like fractions:
192/240 - 210/240 = 192 - 210/240 = -18/240 - After reducing the fraction, the answer is -3/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-70/80 12/30-70/80 36/15-70/80 12/45-70/80 60/15-70/80 12/75-70/80 84/15-70/80