Add 21/81 and 84/10
1st number: 21/81, 2nd number: 8 4/10
21/81 + 84/10 is 1169/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
84/10 = 84 × 81/10 × 81 = 6804/810 - Add the two like fractions:
210/810 + 6804/810 = 210 + 6804/810 = 7014/810 - 7014/810 simplified gives 1169/135
- So, 21/81 + 84/10 = 1169/135
In mixed form: 889/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+84/10 21/81+84/20 63/81+84/10 21/81+84/30 21/81+84/50 21/81+84/70