Add 21/12 and 30/25
1st number: 1 9/12, 2nd number: 1 5/25
21/12 + 30/25 is 59/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 25 is 300
Next, find the equivalent fraction of both fractional numbers with denominator 300 - For the 1st fraction, since 12 × 25 = 300,
21/12 = 21 × 25/12 × 25 = 525/300 - Likewise, for the 2nd fraction, since 25 × 12 = 300,
30/25 = 30 × 12/25 × 12 = 360/300 - Add the two like fractions:
525/300 + 360/300 = 525 + 360/300 = 885/300 - 885/300 simplified gives 59/20
- So, 21/12 + 30/25 = 59/20
In mixed form: 219/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+30/25 21/12+60/25 21/24+30/25 21/12+30/50 63/12+30/25 21/12+90/25 21/36+30/25 21/12+30/75 21/60+30/25 21/84+30/25