Add 20/2 and 5/21
1st number: 10 0/2, 2nd number: 5/21
20/2 + 5/21 is 215/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
20/2 = 20 × 21/2 × 21 = 420/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
5/21 = 5 × 2/21 × 2 = 10/42 - Add the two like fractions:
420/42 + 10/42 = 420 + 10/42 = 430/42 - 430/42 simplified gives 215/21
- So, 20/2 + 5/21 = 215/21
In mixed form: 105/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/2+5/21 20/2+10/21 20/4+5/21 20/2+5/42 60/2+5/21 20/2+15/21 20/6+5/21 20/2+5/63 20/2+25/21 20/10+5/21 20/2+35/21 20/14+5/21