Add 84/9 and 25/21
1st number: 9 3/9, 2nd number: 1 4/21
84/9 + 25/21 is 221/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
84/9 = 84 × 7/9 × 7 = 588/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
25/21 = 25 × 3/21 × 3 = 75/63 - Add the two like fractions:
588/63 + 75/63 = 588 + 75/63 = 663/63 - 663/63 simplified gives 221/21
- So, 84/9 + 25/21 = 221/21
In mixed form: 1011/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/9+50/21 84/18+25/21 84/9+25/42 84/9+75/21 84/27+25/21 84/9+25/63 84/45+25/21 84/63+25/21