Add 21/4 and 90/36
1st number: 5 1/4, 2nd number: 2 18/36
21/4 + 90/36 is 31/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
21/4 = 21 × 9/4 × 9 = 189/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
90/36 = 90 × 1/36 × 1 = 90/36 - Add the two like fractions:
189/36 + 90/36 = 189 + 90/36 = 279/36 - 279/36 simplified gives 31/4
- So, 21/4 + 90/36 = 31/4
In mixed form: 73/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+90/36 21/8+90/36 21/4+90/72 63/4+90/36 21/12+90/36 21/20+90/36 21/28+90/36