Subtract 63/4 from 45/21
1st number: 2 3/21, 2nd number: 15 3/4
45/21 - 63/4 is -381/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
63/4 = 63 × 21/4 × 21 = 1323/84 - Subtract the two like fractions:
180/84 - 1323/84 = 180 - 1323/84 = -1143/84 - After reducing the fraction, the answer is -381/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-63/4 45/42-63/4 45/21-63/8 45/63-63/4 45/21-63/12 45/21-63/20 45/21-63/28