Add 30/21 and 70/81
1st number: 1 9/21, 2nd number: 70/81
30/21 + 70/81 is 1300/567.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
30/21 = 30 × 27/21 × 27 = 810/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
70/81 = 70 × 7/81 × 7 = 490/567 - Add the two like fractions:
810/567 + 490/567 = 810 + 490/567 = 1300/567 - So, 30/21 + 70/81 = 1300/567
In mixed form: 2166/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+70/81 30/42+70/81 90/21+70/81 30/63+70/81