Add 21/12 and 90/36
1st number: 1 9/12, 2nd number: 2 18/36
21/12 + 90/36 is 17/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
90/36 = 90 × 1/36 × 1 = 90/36 - Add the two like fractions:
63/36 + 90/36 = 63 + 90/36 = 153/36 - 153/36 simplified gives 17/4
- So, 21/12 + 90/36 = 17/4
In mixed form: 41/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+90/36 21/24+90/36 21/12+90/72 63/12+90/36 21/36+90/36 21/60+90/36 21/84+90/36