Add 81/21 and 25/18
1st number: 3 18/21, 2nd number: 1 7/18
81/21 + 25/18 is 661/126.
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,
81/21 = 81 × 6/21 × 6 = 486/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
25/18 = 25 × 7/18 × 7 = 175/126 - Add the two like fractions:
486/126 + 175/126 = 486 + 175/126 = 661/126 - So, 81/21 + 25/18 = 661/126
In mixed form: 531/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+50/18 81/42+25/18 81/21+25/36 81/21+75/18 81/63+25/18 81/21+25/54 81/21+25/90