Add 84/90 and 63/21
1st number: 84/90, 2nd number: 3 0/21
84/90 + 63/21 is 59/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
84/90 = 84 × 7/90 × 7 = 588/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
63/21 = 63 × 30/21 × 30 = 1890/630 - Add the two like fractions:
588/630 + 1890/630 = 588 + 1890/630 = 2478/630 - 2478/630 simplified gives 59/15
- So, 84/90 + 63/21 = 59/15
In mixed form: 314/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+63/42