Add 81/84 and 63/30
1st number: 81/84, 2nd number: 2 3/30
81/84 + 63/30 is 429/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
81/84 = 81 × 5/84 × 5 = 405/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
63/30 = 63 × 14/30 × 14 = 882/420 - Add the two like fractions:
405/420 + 882/420 = 405 + 882/420 = 1287/420 - 1287/420 simplified gives 429/140
- So, 81/84 + 63/30 = 429/140
In mixed form: 39/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+63/60 81/84+63/90