Add 1/21 and 84/54
1st number: 1/21, 2nd number: 1 30/54
1/21 + 84/54 is 101/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
1/21 = 1 × 18/21 × 18 = 18/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
84/54 = 84 × 7/54 × 7 = 588/378 - Add the two like fractions:
18/378 + 588/378 = 18 + 588/378 = 606/378 - 606/378 simplified gives 101/63
- So, 1/21 + 84/54 = 101/63
In mixed form: 138/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+84/54 1/42+84/54 3/21+84/54 1/63+84/54 5/21+84/54 7/21+84/54