Add 18/20 and 56/21
1st number: 18/20, 2nd number: 2 14/21
18/20 + 56/21 is 107/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
18/20 = 18 × 21/20 × 21 = 378/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
56/21 = 56 × 20/21 × 20 = 1120/420 - Add the two like fractions:
378/420 + 1120/420 = 378 + 1120/420 = 1498/420 - 1498/420 simplified gives 107/30
- So, 18/20 + 56/21 = 107/30
In mixed form: 317/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+56/21 18/40+56/21 18/20+56/42 54/20+56/21 18/60+56/21 18/20+56/63 90/20+56/21