Add 42/49 and 18/63
42/49 + 18/63 is 8/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 63 is 441
Next, find the equivalent fraction of both fractional numbers with denominator 441 - For the 1st fraction, since 49 × 9 = 441,
42/49 = 42 × 9/49 × 9 = 378/441 - Likewise, for the 2nd fraction, since 63 × 7 = 441,
18/63 = 18 × 7/63 × 7 = 126/441 - Add the two like fractions:
378/441 + 126/441 = 378 + 126/441 = 504/441 - 504/441 simplified gives 8/7
- So, 42/49 + 18/63 = 8/7
In mixed form: 11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/49+18/63 42/49+36/63 42/98+18/63 42/49+54/63 42/49+90/63