Subtract 1/80 from 15/42
15/42 - 1/80 is 193/560.
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,
1/80 = 1 × 21/80 × 21 = 21/1680 - Subtract the two like fractions:
600/1680 - 21/1680 = 600 - 21/1680 = 579/1680 - After reducing the fraction, the answer is 193/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-1/80 15/42-2/80 15/84-1/80 45/42-1/80 15/42-3/80 75/42-1/80 15/42-5/80 15/42-7/80