Subtract 21/4 from 45/63
1st number: 45/63, 2nd number: 5 1/4
45/63 - 21/4 is -127/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 4 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
45/63 = 45 × 4/63 × 4 = 180/252 - Likewise, for the 2nd fraction, since 4 × 63 = 252,
21/4 = 21 × 63/4 × 63 = 1323/252 - Subtract the two like fractions:
180/252 - 1323/252 = 180 - 1323/252 = -1143/252 - After reducing the fraction, the answer is -127/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/63-21/4 45/63-42/4 45/63-21/8 45/63-63/4 45/63-21/12 45/63-21/20 45/63-21/28