Add 18/2 and 84/21
1st number: 9 0/2, 2nd number: 4 0/21
18/2 + 84/21 is 13/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
18/2 = 18 × 21/2 × 21 = 378/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
84/21 = 84 × 2/21 × 2 = 168/42 - Add the two like fractions:
378/42 + 168/42 = 378 + 168/42 = 546/42 - 546/42 simplified gives 13/1
- So, 18/2 + 84/21 = 13/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/2+84/21 18/4+84/21 18/2+84/42 54/2+84/21 18/6+84/21 18/2+84/63 90/2+84/21 18/10+84/21 18/14+84/21