Subtract 21/54 from 70/45
1st number: 1 25/45, 2nd number: 21/54
70/45 - 21/54 is 7/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 45 × 6 = 270,
70/45 = 70 × 6/45 × 6 = 420/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Subtract the two like fractions:
420/270 - 105/270 = 420 - 105/270 = 315/270 - After reducing the fraction, the answer is 7/6
- In mixed form: 11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/45-42/54 70/90-21/54 70/45-63/54