Add 1/5 and 84/21
1st number: 1/5, 2nd number: 4 0/21
1/5 + 84/21 is 21/5.
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,
1/5 = 1 × 21/5 × 21 = 21/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
84/21 = 84 × 5/21 × 5 = 420/105 - Add the two like fractions:
21/105 + 420/105 = 21 + 420/105 = 441/105 - 441/105 simplified gives 21/5
- So, 1/5 + 84/21 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5+84/21 1/10+84/21 1/5+84/42 3/5+84/21 1/15+84/21 1/5+84/63 1/25+84/21 7/5+84/21 1/35+84/21