Add 25/42 and 21/45
25/42 + 21/45 is 223/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
25/42 = 25 × 15/42 × 15 = 375/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
21/45 = 21 × 14/45 × 14 = 294/630 - Add the two like fractions:
375/630 + 294/630 = 375 + 294/630 = 669/630 - 669/630 simplified gives 223/210
- So, 25/42 + 21/45 = 223/210
In mixed form: 113/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42+21/45 25/42+42/45 25/84+21/45 25/42+21/90 75/42+21/45 25/42+63/45