Add 18/42 and 42/63
18/42 + 42/63 is 23/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
18/42 = 18 × 3/42 × 3 = 54/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
42/63 = 42 × 2/63 × 2 = 84/126 - Add the two like fractions:
54/126 + 84/126 = 54 + 84/126 = 138/126 - 138/126 simplified gives 23/21
- So, 18/42 + 42/63 = 23/21
In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+42/63 18/42+84/63 18/84+42/63 54/42+42/63 90/42+42/63