Add 21/4 and 45/54
1st number: 5 1/4, 2nd number: 45/54
21/4 + 45/54 is 73/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 54 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 4 × 27 = 108,
21/4 = 21 × 27/4 × 27 = 567/108 - Likewise, for the 2nd fraction, since 54 × 2 = 108,
45/54 = 45 × 2/54 × 2 = 90/108 - Add the two like fractions:
567/108 + 90/108 = 567 + 90/108 = 657/108 - 657/108 simplified gives 73/12
- So, 21/4 + 45/54 = 73/12
In mixed form: 61/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+45/54 21/4+90/54 21/8+45/54 63/4+45/54 21/12+45/54 21/20+45/54 21/28+45/54