Add 9/12 and 25/21
1st number: 9/12, 2nd number: 1 4/21
9/12 + 25/21 is 163/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
25/21 = 25 × 4/21 × 4 = 100/84 - Add the two like fractions:
63/84 + 100/84 = 63 + 100/84 = 163/84 - So, 9/12 + 25/21 = 163/84
In mixed form: 179/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12+25/21 9/12+50/21 9/24+25/21 9/12+25/42 27/12+25/21 9/12+75/21 9/36+25/21 9/12+25/63 45/12+25/21 9/60+25/21 63/12+25/21 9/84+25/21