Subtract 70/42 from 20/24
1st number: 20/24, 2nd number: 1 28/42
20/24 - 70/42 is -5/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
20/24 = 20 × 7/24 × 7 = 140/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
70/42 = 70 × 4/42 × 4 = 280/168 - Subtract the two like fractions:
140/168 - 280/168 = 140 - 280/168 = -140/168 - After reducing the fraction, the answer is -5/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/24-70/42 20/48-70/42 20/24-70/84 60/24-70/42 20/72-70/42