Add 20/21 and 20/4
1st number: 20/21, 2nd number: 5 0/4
20/21 + 20/4 is 125/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
20/4 = 20 × 21/4 × 21 = 420/84 - Add the two like fractions:
80/84 + 420/84 = 80 + 420/84 = 500/84 - 500/84 simplified gives 125/21
- So, 20/21 + 20/4 = 125/21
In mixed form: 520/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+20/4 20/21+40/4 20/42+20/4 20/21+20/8 60/21+20/4 20/21+60/4 20/63+20/4 20/21+20/12 20/21+20/28