Add 4/16 and 18/21
4/16 + 18/21 is 31/28.
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,
4/16 = 4 × 21/16 × 21 = 84/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
18/21 = 18 × 16/21 × 16 = 288/336 - Add the two like fractions:
84/336 + 288/336 = 84 + 288/336 = 372/336 - 372/336 simplified gives 31/28
- So, 4/16 + 18/21 = 31/28
In mixed form: 13/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/16+18/21 4/16+36/21 4/32+18/21 4/16+18/42 12/16+18/21 4/16+54/21 4/48+18/21 4/16+18/63 20/16+18/21 4/16+90/21 4/80+18/21 28/16+18/21