Subtract 12/80 from 28/42
28/42 - 12/80 is 31/60.
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,
28/42 = 28 × 40/42 × 40 = 1120/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
12/80 = 12 × 21/80 × 21 = 252/1680 - Subtract the two like fractions:
1120/1680 - 252/1680 = 1120 - 252/1680 = 868/1680 - After reducing the fraction, the answer is 31/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-12/80 28/42-24/80 28/84-12/80 84/42-12/80 28/42-36/80 28/42-60/80 28/42-84/80