Add 25/45 and 18/21
25/45 + 18/21 is 89/63.
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,
18/21 = 18 × 15/21 × 15 = 270/315 - Add the two like fractions:
175/315 + 270/315 = 175 + 270/315 = 445/315 - 445/315 simplified gives 89/63
- So, 25/45 + 18/21 = 89/63
In mixed form: 126/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/45+18/21 25/45+36/21 25/90+18/21 25/45+18/42 75/45+18/21 25/45+54/21 25/45+18/63 25/45+90/21