Subtract 20/18 from 70/84
1st number: 70/84, 2nd number: 1 2/18
70/84 - 20/18 is -5/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
70/84 = 70 × 3/84 × 3 = 210/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
20/18 = 20 × 14/18 × 14 = 280/252 - Subtract the two like fractions:
210/252 - 280/252 = 210 - 280/252 = -70/252 - After reducing the fraction, the answer is -5/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84-40/18 70/84-20/36 70/84-60/18 70/84-20/54 70/84-20/90