Add 84/36 and 5/21
1st number: 2 12/36, 2nd number: 5/21
84/36 + 5/21 is 18/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
84/36 = 84 × 7/36 × 7 = 588/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
5/21 = 5 × 12/21 × 12 = 60/252 - Add the two like fractions:
588/252 + 60/252 = 588 + 60/252 = 648/252 - 648/252 simplified gives 18/7
- So, 84/36 + 5/21 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/36+10/21 84/72+5/21 84/36+5/42 84/36+15/21 84/36+5/63 84/36+25/21 84/36+35/21