Add 7/25 and 81/21
1st number: 7/25, 2nd number: 3 18/21
7/25 + 81/21 is 724/175.
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,
7/25 = 7 × 21/25 × 21 = 147/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
81/21 = 81 × 25/21 × 25 = 2025/525 - Add the two like fractions:
147/525 + 2025/525 = 147 + 2025/525 = 2172/525 - 2172/525 simplified gives 724/175
- So, 7/25 + 81/21 = 724/175
In mixed form: 424/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/25+81/21 7/50+81/21 7/25+81/42 21/25+81/21 7/75+81/21 7/25+81/63 35/25+81/21 49/25+81/21