Subtract 70/18 from 90/27
1st number: 3 9/27, 2nd number: 3 16/18
90/27 - 70/18 is -5/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 18 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 27 × 2 = 54,
90/27 = 90 × 2/27 × 2 = 180/54 - Likewise, for the 2nd fraction, since 18 × 3 = 54,
70/18 = 70 × 3/18 × 3 = 210/54 - Subtract the two like fractions:
180/54 - 210/54 = 180 - 210/54 = -30/54 - After reducing the fraction, the answer is -5/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54-70/18 90/27-70/36 90/81-70/18 90/27-70/54 90/27-70/90