Subtract 1/80 from 70/42
1st number: 1 28/42, 2nd number: 1/80
70/42 - 1/80 is 397/240.
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,
70/42 = 70 × 40/42 × 40 = 2800/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
1/80 = 1 × 21/80 × 21 = 21/1680 - Subtract the two like fractions:
2800/1680 - 21/1680 = 2800 - 21/1680 = 2779/1680 - After reducing the fraction, the answer is 397/240
- In mixed form: 1157/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-2/80 70/84-1/80 70/42-3/80 70/42-5/80 70/42-7/80