Add 1/20 and 10/21
1/20 + 10/21 is 221/420.
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,
1/20 = 1 × 21/20 × 21 = 21/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
10/21 = 10 × 20/21 × 20 = 200/420 - Add the two like fractions:
21/420 + 200/420 = 21 + 200/420 = 221/420 - So, 1/20 + 10/21 = 221/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20+10/21 1/20+20/21 1/40+10/21 1/20+10/42 3/20+10/21 1/20+30/21 1/60+10/21 1/20+10/63 5/20+10/21 1/20+50/21 7/20+10/21 1/20+70/21