Add 15/21 and 16/18
15/21 + 16/18 is 101/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
15/21 = 15 × 6/21 × 6 = 90/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
16/18 = 16 × 7/18 × 7 = 112/126 - Add the two like fractions:
90/126 + 112/126 = 90 + 112/126 = 202/126 - 202/126 simplified gives 101/63
- So, 15/21 + 16/18 = 101/63
In mixed form: 138/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+16/18 15/21+32/18 15/42+16/18 15/21+16/36 45/21+16/18 15/21+48/18 15/63+16/18 15/21+16/54 75/21+16/18 15/21+80/18 15/21+16/90