Add 21/10 and 30/81
1st number: 2 1/10, 2nd number: 30/81
21/10 + 30/81 is 667/270.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 10 × 81 = 810,
21/10 = 21 × 81/10 × 81 = 1701/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
30/81 = 30 × 10/81 × 10 = 300/810 - Add the two like fractions:
1701/810 + 300/810 = 1701 + 300/810 = 2001/810 - 2001/810 simplified gives 667/270
- So, 21/10 + 30/81 = 667/270
In mixed form: 2127/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+30/81 21/10+60/81 21/20+30/81 63/10+30/81 21/10+90/81 21/30+30/81 21/50+30/81 21/70+30/81