Subtract 70/90 from 42/18
1st number: 2 6/18, 2nd number: 70/90
42/18 - 70/90 is 14/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
70/90 = 70 × 1/90 × 1 = 70/90 - Subtract the two like fractions:
210/90 - 70/90 = 210 - 70/90 = 140/90 - After reducing the fraction, the answer is 14/9
- In mixed form: 15/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-70/90 42/36-70/90 42/54-70/90 42/90-70/90