Add 20/21 and 3/5
20/21 + 3/5 is 163/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
20/21 = 20 × 5/21 × 5 = 100/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
3/5 = 3 × 21/5 × 21 = 63/105 - Add the two like fractions:
100/105 + 63/105 = 100 + 63/105 = 163/105 - So, 20/21 + 3/5 = 163/105
In mixed form: 158/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+3/5 20/21+6/5 20/42+3/5 20/21+3/10 60/21+3/5 20/21+9/5 20/63+3/5 20/21+3/15 20/21+15/5 20/21+3/25 20/21+21/5 20/21+3/35