Add 1/42 and 21/45
1/42 + 21/45 is 103/210.
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,
1/42 = 1 × 15/42 × 15 = 15/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
21/45 = 21 × 14/45 × 14 = 294/630 - Add the two like fractions:
15/630 + 294/630 = 15 + 294/630 = 309/630 - 309/630 simplified gives 103/210
- So, 1/42 + 21/45 = 103/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42+21/45 1/42+42/45 1/84+21/45 1/42+21/90 3/42+21/45 1/42+63/45 5/42+21/45 7/42+21/45