Add 21/84 and 63/30
1st number: 21/84, 2nd number: 2 3/30
21/84 + 63/30 is 47/20.
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,
21/84 = 21 × 5/84 × 5 = 105/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
63/30 = 63 × 14/30 × 14 = 882/420 - Add the two like fractions:
105/420 + 882/420 = 105 + 882/420 = 987/420 - 987/420 simplified gives 47/20
- So, 21/84 + 63/30 = 47/20
In mixed form: 27/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+63/30 21/84+63/60 63/84+63/30 21/84+63/90