Add 20/25 and 1/21
20/25 + 1/21 is 89/105.
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,
1/21 = 1 × 25/21 × 25 = 25/525 - Add the two like fractions:
420/525 + 25/525 = 420 + 25/525 = 445/525 - 445/525 simplified gives 89/105
- So, 20/25 + 1/21 = 89/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/25+1/21 20/25+2/21 20/50+1/21 20/25+1/42 60/25+1/21 20/25+3/21 20/75+1/21 20/25+1/63 20/25+5/21 20/25+7/21