Add 2/30 and 81/21
1st number: 2/30, 2nd number: 3 18/21
2/30 + 81/21 is 412/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
2/30 = 2 × 7/30 × 7 = 14/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
81/21 = 81 × 10/21 × 10 = 810/210 - Add the two like fractions:
14/210 + 810/210 = 14 + 810/210 = 824/210 - 824/210 simplified gives 412/105
- So, 2/30 + 81/21 = 412/105
In mixed form: 397/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/30+81/21 2/60+81/21 2/30+81/42 6/30+81/21 2/90+81/21 2/30+81/63 10/30+81/21 14/30+81/21