Add 42/63 and 18/21
42/63 + 18/21 is 32/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
18/21 = 18 × 3/21 × 3 = 54/63 - Add the two like fractions:
42/63 + 54/63 = 42 + 54/63 = 96/63 - 96/63 simplified gives 32/21
- So, 42/63 + 18/21 = 32/21
In mixed form: 111/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/63+18/21 42/63+36/21 42/63+18/42 42/63+54/21 42/63+18/63 42/63+90/21