Add 84/21 and 63/45
1st number: 4 0/21, 2nd number: 1 18/45
84/21 + 63/45 is 27/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
84/21 = 84 × 15/21 × 15 = 1260/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
63/45 = 63 × 7/45 × 7 = 441/315 - Add the two like fractions:
1260/315 + 441/315 = 1260 + 441/315 = 1701/315 - 1701/315 simplified gives 27/5
- So, 84/21 + 63/45 = 27/5
In mixed form: 52/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/42+63/45 84/21+63/90 84/63+63/45