Add 5/20 and 10/21
5/20 + 10/21 is 61/84.
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,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
10/21 = 10 × 20/21 × 20 = 200/420 - Add the two like fractions:
105/420 + 200/420 = 105 + 200/420 = 305/420 - 305/420 simplified gives 61/84
- So, 5/20 + 10/21 = 61/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+10/21 5/20+20/21 5/40+10/21 5/20+10/42 15/20+10/21 5/20+30/21 5/60+10/21 5/20+10/63 25/20+10/21 5/20+50/21 35/20+10/21 5/20+70/21