Add 12/84 and 25/21
1st number: 12/84, 2nd number: 1 4/21
12/84 + 25/21 is 4/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
12/84 = 12 × 1/84 × 1 = 12/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
25/21 = 25 × 4/21 × 4 = 100/84 - Add the two like fractions:
12/84 + 100/84 = 12 + 100/84 = 112/84 - 112/84 simplified gives 4/3
- So, 12/84 + 25/21 = 4/3
In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/84+25/21 12/84+50/21 12/84+25/42 36/84+25/21 12/84+75/21 12/84+25/63 60/84+25/21