Subtract 7/80 from 42/84
42/84 - 7/80 is 33/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
42/84 = 42 × 20/84 × 20 = 840/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
7/80 = 7 × 21/80 × 21 = 147/1680 - Subtract the two like fractions:
840/1680 - 147/1680 = 840 - 147/1680 = 693/1680 - After reducing the fraction, the answer is 33/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-14/80 42/84-21/80 42/84-35/80 42/84-49/80