Subtract 8/80 from 15/42
15/42 - 8/80 is 9/35.
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,
8/80 = 8 × 21/80 × 21 = 168/1680 - Subtract the two like fractions:
600/1680 - 168/1680 = 600 - 168/1680 = 432/1680 - After reducing the fraction, the answer is 9/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-8/80 15/42-16/80 15/84-8/80 45/42-8/80 15/42-24/80 75/42-8/80 15/42-40/80 15/42-56/80