Add 25/45 and 30/21
1st number: 25/45, 2nd number: 1 9/21
25/45 + 30/21 is 125/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
25/45 = 25 × 7/45 × 7 = 175/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
30/21 = 30 × 15/21 × 15 = 450/315 - Add the two like fractions:
175/315 + 450/315 = 175 + 450/315 = 625/315 - 625/315 simplified gives 125/63
- So, 25/45 + 30/21 = 125/63
In mixed form: 162/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/45+30/21 25/45+60/21 25/90+30/21 25/45+30/42 75/45+30/21 25/45+90/21 25/45+30/63