Add 45/21 and 5/20
1st number: 2 3/21, 2nd number: 5/20
45/21 + 5/20 is 67/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
45/21 = 45 × 20/21 × 20 = 900/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Add the two like fractions:
900/420 + 105/420 = 900 + 105/420 = 1005/420 - 1005/420 simplified gives 67/28
- So, 45/21 + 5/20 = 67/28
In mixed form: 211/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+5/20 45/21+10/20 45/42+5/20 45/21+5/40 45/21+15/20 45/63+5/20 45/21+5/60 45/21+25/20 45/21+35/20