Add 25/20 and 3/21
1st number: 1 5/20, 2nd number: 3/21
25/20 + 3/21 is 39/28.
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,
25/20 = 25 × 21/20 × 21 = 525/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
3/21 = 3 × 20/21 × 20 = 60/420 - Add the two like fractions:
525/420 + 60/420 = 525 + 60/420 = 585/420 - 585/420 simplified gives 39/28
- So, 25/20 + 3/21 = 39/28
In mixed form: 111/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/20+3/21 25/20+6/21 25/40+3/21 25/20+3/42 75/20+3/21 25/20+9/21 25/60+3/21 25/20+3/63 25/20+15/21