Add 30/21 and 25/45
1st number: 1 9/21, 2nd number: 25/45
30/21 + 25/45 is 125/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 21 × 15 = 315,
30/21 = 30 × 15/21 × 15 = 450/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
25/45 = 25 × 7/45 × 7 = 175/315 - Add the two like fractions:
450/315 + 175/315 = 450 + 175/315 = 625/315 - 625/315 simplified gives 125/63
- So, 30/21 + 25/45 = 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: 60/21+25/45 30/21+50/45 30/42+25/45 30/21+25/90 90/21+25/45 30/21+75/45 30/63+25/45