Add 21/5 and 84/21
1st number: 4 1/5, 2nd number: 4 0/21
21/5 + 84/21 is 41/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
21/5 = 21 × 21/5 × 21 = 441/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
84/21 = 84 × 5/21 × 5 = 420/105 - Add the two like fractions:
441/105 + 420/105 = 441 + 420/105 = 861/105 - 861/105 simplified gives 41/5
- So, 21/5 + 84/21 = 41/5
In mixed form: 81/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+84/21 21/10+84/21 21/5+84/42 63/5+84/21 21/15+84/21 21/5+84/63 21/25+84/21 21/35+84/21