Subtract 4/80 from 12/42
12/42 - 4/80 is 33/140.
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,
12/42 = 12 × 40/42 × 40 = 480/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
4/80 = 4 × 21/80 × 21 = 84/1680 - Subtract the two like fractions:
480/1680 - 84/1680 = 480 - 84/1680 = 396/1680 - After reducing the fraction, the answer is 33/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42-4/80 12/42-8/80 12/84-4/80 36/42-4/80 12/42-12/80 60/42-4/80 12/42-20/80 84/42-4/80 12/42-28/80