Add 10/21 and 25/20
1st number: 10/21, 2nd number: 1 5/20
10/21 + 25/20 is 145/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
10/21 = 10 × 20/21 × 20 = 200/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
25/20 = 25 × 21/20 × 21 = 525/420 - Add the two like fractions:
200/420 + 525/420 = 200 + 525/420 = 725/420 - 725/420 simplified gives 145/84
- So, 10/21 + 25/20 = 145/84
In mixed form: 161/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+25/20 10/21+50/20 10/42+25/20 10/21+25/40 30/21+25/20 10/21+75/20 10/63+25/20 10/21+25/60 50/21+25/20 70/21+25/20