Subtract 18/5 from 70/42
1st number: 1 28/42, 2nd number: 3 3/5
70/42 - 18/5 is -29/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
70/42 = 70 × 5/42 × 5 = 350/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
18/5 = 18 × 42/5 × 42 = 756/210 - Subtract the two like fractions:
350/210 - 756/210 = 350 - 756/210 = -406/210 - After reducing the fraction, the answer is -29/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42-36/5 70/84-18/5 70/42-18/10 70/42-54/5 70/42-18/15 70/42-90/5 70/42-18/25 70/42-18/35