Subtract 28/80 from 80/42
1st number: 1 38/42, 2nd number: 28/80
80/42 - 28/80 is 653/420.
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,
80/42 = 80 × 40/42 × 40 = 3200/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
28/80 = 28 × 21/80 × 21 = 588/1680 - Subtract the two like fractions:
3200/1680 - 588/1680 = 3200 - 588/1680 = 2612/1680 - After reducing the fraction, the answer is 653/420
- In mixed form: 1233/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42-56/80 80/84-28/80 80/42-84/80