Subtract 70/15 from 21/54
1st number: 21/54, 2nd number: 4 10/15
21/54 - 70/15 is -77/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 15 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Likewise, for the 2nd fraction, since 15 × 18 = 270,
70/15 = 70 × 18/15 × 18 = 1260/270 - Subtract the two like fractions:
105/270 - 1260/270 = 105 - 1260/270 = -1155/270 - After reducing the fraction, the answer is -77/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54-70/15 21/54-70/30 63/54-70/15 21/54-70/45 21/54-70/75