Add 20/25 and 20/21
20/25 + 20/21 is 184/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 25 × 21 = 525,
20/25 = 20 × 21/25 × 21 = 420/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
20/21 = 20 × 25/21 × 25 = 500/525 - Add the two like fractions:
420/525 + 500/525 = 420 + 500/525 = 920/525 - 920/525 simplified gives 184/105
- So, 20/25 + 20/21 = 184/105
In mixed form: 179/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/25+20/21 20/25+40/21 20/50+20/21 20/25+20/42 60/25+20/21 20/25+60/21 20/75+20/21 20/25+20/63