Subtract 7/80 from 10/42
10/42 - 7/80 is 253/1680.
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,
10/42 = 10 × 40/42 × 40 = 400/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
7/80 = 7 × 21/80 × 21 = 147/1680 - Subtract the two like fractions:
400/1680 - 147/1680 = 400 - 147/1680 = 253/1680
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-7/80 10/42-14/80 10/84-7/80 30/42-7/80 10/42-21/80 50/42-7/80 10/42-35/80 70/42-7/80 10/42-49/80