Add 21/42 and 4/16
21/42 + 4/16 is 3/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 42 × 8 = 336,
21/42 = 21 × 8/42 × 8 = 168/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
4/16 = 4 × 21/16 × 21 = 84/336 - Add the two like fractions:
168/336 + 84/336 = 168 + 84/336 = 252/336 - 252/336 simplified gives 3/4
- So, 21/42 + 4/16 = 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+8/16 21/84+4/16 21/42+4/32 63/42+4/16 21/42+12/16 21/42+4/48 21/42+20/16 21/42+4/80 21/42+28/16