Add 45/4 and 20/21
1st number: 11 1/4, 2nd number: 20/21
45/4 + 20/21 is 1025/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
45/4 = 45 × 21/4 × 21 = 945/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Add the two like fractions:
945/84 + 80/84 = 945 + 80/84 = 1025/84 - So, 45/4 + 20/21 = 1025/84
In mixed form: 1217/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4+20/21 45/4+40/21 45/8+20/21 45/4+20/42 45/4+60/21 45/12+20/21 45/4+20/63 45/20+20/21 45/28+20/21