Add 81/18 and 2/21
1st number: 4 9/18, 2nd number: 2/21
81/18 + 2/21 is 193/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
81/18 = 81 × 7/18 × 7 = 567/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
2/21 = 2 × 6/21 × 6 = 12/126 - Add the two like fractions:
567/126 + 12/126 = 567 + 12/126 = 579/126 - 579/126 simplified gives 193/42
- So, 81/18 + 2/21 = 193/42
In mixed form: 425/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18+4/21 81/36+2/21 81/18+2/42 81/18+6/21 81/54+2/21 81/18+2/63 81/18+10/21 81/90+2/21 81/18+14/21