Add 21/36 and 90/72
1st number: 21/36, 2nd number: 1 18/72
21/36 + 90/72 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 36 × 2 = 72,
21/36 = 21 × 2/36 × 2 = 42/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
90/72 = 90 × 1/72 × 1 = 90/72 - Add the two like fractions:
42/72 + 90/72 = 42 + 90/72 = 132/72 - 132/72 simplified gives 11/6
- So, 21/36 + 90/72 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+90/72 21/72+90/72 63/36+90/72