Add 9/36 and 42/21
1st number: 9/36, 2nd number: 2 0/21
9/36 + 42/21 is 9/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
9/36 = 9 × 7/36 × 7 = 63/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
42/21 = 42 × 12/21 × 12 = 504/252 - Add the two like fractions:
63/252 + 504/252 = 63 + 504/252 = 567/252 - 567/252 simplified gives 9/4
- So, 9/36 + 42/21 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36+42/21 9/36+84/21 9/72+42/21 27/36+42/21 9/36+42/63 45/36+42/21 63/36+42/21