Add 18/21 and 16/63
18/21 + 16/63 is 10/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
18/21 = 18 × 3/21 × 3 = 54/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
16/63 = 16 × 1/63 × 1 = 16/63 - Add the two like fractions:
54/63 + 16/63 = 54 + 16/63 = 70/63 - 70/63 simplified gives 10/9
- So, 18/21 + 16/63 = 10/9
In mixed form: 11/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+16/63 18/21+32/63 18/42+16/63 54/21+16/63 18/21+48/63 18/63+16/63 90/21+16/63 18/21+80/63