Add 10/25 and 21/42
10/25 + 21/42 is 9/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 42 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 25 × 42 = 1050,
10/25 = 10 × 42/25 × 42 = 420/1050 - Likewise, for the 2nd fraction, since 42 × 25 = 1050,
21/42 = 21 × 25/42 × 25 = 525/1050 - Add the two like fractions:
420/1050 + 525/1050 = 420 + 525/1050 = 945/1050 - 945/1050 simplified gives 9/10
- So, 10/25 + 21/42 = 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/25+21/42 10/50+21/42 10/25+21/84 30/25+21/42 10/25+63/42 10/75+21/42 50/25+21/42 70/25+21/42