Subtract 45/63 from 70/21
1st number: 3 7/21, 2nd number: 45/63
70/21 - 45/63 is 55/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
70/21 = 70 × 3/21 × 3 = 210/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
45/63 = 45 × 1/63 × 1 = 45/63 - Subtract the two like fractions:
210/63 - 45/63 = 210 - 45/63 = 165/63 - After reducing the fraction, the answer is 55/21
- In mixed form: 213/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-90/63 70/42-45/63 70/63-45/63