Add 84/21 and 54/18
1st number: 4 0/21, 2nd number: 3 0/18
84/21 + 54/18 is 7/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
84/21 = 84 × 6/21 × 6 = 504/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
54/18 = 54 × 7/18 × 7 = 378/126 - Add the two like fractions:
504/126 + 378/126 = 504 + 378/126 = 882/126 - 882/126 simplified gives 7/1
- So, 84/21 + 54/18 = 7/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/42+54/18 84/21+54/36 84/63+54/18 84/21+54/90