Subtract 63/80 from 15/42
15/42 - 63/80 is -241/560.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
15/42 = 15 × 40/42 × 40 = 600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
63/80 = 63 × 21/80 × 21 = 1323/1680 - Subtract the two like fractions:
600/1680 - 1323/1680 = 600 - 1323/1680 = -723/1680 - After reducing the fraction, the answer is -241/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-63/80 15/84-63/80 45/42-63/80 75/42-63/80