Subtract 3/80 from 7/42
7/42 - 3/80 is 31/240.
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,
7/42 = 7 × 40/42 × 40 = 280/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
3/80 = 3 × 21/80 × 21 = 63/1680 - Subtract the two like fractions:
280/1680 - 63/1680 = 280 - 63/1680 = 217/1680 - After reducing the fraction, the answer is 31/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-3/80 7/42-6/80 7/84-3/80 21/42-3/80 7/42-9/80 35/42-3/80 7/42-15/80 49/42-3/80 7/42-21/80