Add 84/16 and 72/21
1st number: 5 4/16, 2nd number: 3 9/21
84/16 + 72/21 is 243/28.
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,
84/16 = 84 × 21/16 × 21 = 1764/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
72/21 = 72 × 16/21 × 16 = 1152/336 - Add the two like fractions:
1764/336 + 1152/336 = 1764 + 1152/336 = 2916/336 - 2916/336 simplified gives 243/28
- So, 84/16 + 72/21 = 243/28
In mixed form: 819/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/32+72/21 84/16+72/42 84/48+72/21 84/16+72/63 84/80+72/21