Add 25/12 and 18/21
1st number: 2 1/12, 2nd number: 18/21
25/12 + 18/21 is 247/84.
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,
25/12 = 25 × 7/12 × 7 = 175/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Add the two like fractions:
175/84 + 72/84 = 175 + 72/84 = 247/84 - So, 25/12 + 18/21 = 247/84
In mixed form: 279/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/12+18/21 25/12+36/21 25/24+18/21 25/12+18/42 75/12+18/21 25/12+54/21 25/36+18/21 25/12+18/63 25/12+90/21 25/60+18/21 25/84+18/21