Add 21/42 and 9/36
21/42 + 9/36 is 3/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 42 × 6 = 252,
21/42 = 21 × 6/42 × 6 = 126/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
9/36 = 9 × 7/36 × 7 = 63/252 - Add the two like fractions:
126/252 + 63/252 = 126 + 63/252 = 189/252 - 189/252 simplified gives 3/4
- So, 21/42 + 9/36 = 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+18/36 21/84+9/36 21/42+9/72 63/42+9/36 21/42+27/36 21/42+45/36 21/42+63/36