Add 81/21 and 20/16
1st number: 3 18/21, 2nd number: 1 4/16
81/21 + 20/16 is 143/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
81/21 = 81 × 16/21 × 16 = 1296/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
20/16 = 20 × 21/16 × 21 = 420/336 - Add the two like fractions:
1296/336 + 420/336 = 1296 + 420/336 = 1716/336 - 1716/336 simplified gives 143/28
- So, 81/21 + 20/16 = 143/28
In mixed form: 53/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21+40/16 81/42+20/16 81/21+20/32 81/21+60/16 81/63+20/16 81/21+20/48 81/21+20/80