Add 21/90 and 84/45
1st number: 21/90, 2nd number: 1 39/45
21/90 + 84/45 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
84/45 = 84 × 2/45 × 2 = 168/90 - Add the two like fractions:
21/90 + 168/90 = 21 + 168/90 = 189/90 - 189/90 simplified gives 21/10
- So, 21/90 + 84/45 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+84/45 21/90+84/90 63/90+84/45