Add 12/16 and 30/21
1st number: 12/16, 2nd number: 1 9/21
12/16 + 30/21 is 61/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
12/16 = 12 × 21/16 × 21 = 252/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
30/21 = 30 × 16/21 × 16 = 480/336 - Add the two like fractions:
252/336 + 480/336 = 252 + 480/336 = 732/336 - 732/336 simplified gives 61/28
- So, 12/16 + 30/21 = 61/28
In mixed form: 25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/16+30/21 12/16+60/21 12/32+30/21 12/16+30/42 36/16+30/21 12/16+90/21 12/48+30/21 12/16+30/63 60/16+30/21 12/80+30/21 84/16+30/21