Add 21/4 and 42/84
1st number: 5 1/4, 2nd number: 42/84
21/4 + 42/84 is 23/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
21/4 = 21 × 21/4 × 21 = 441/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Add the two like fractions:
441/84 + 42/84 = 441 + 42/84 = 483/84 - 483/84 simplified gives 23/4
- So, 21/4 + 42/84 = 23/4
In mixed form: 53/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+42/84 21/8+42/84 63/4+42/84 21/12+42/84 21/20+42/84 21/28+42/84