Add 36/21 and 72/18
1st number: 1 15/21, 2nd number: 4 0/18
36/21 + 72/18 is 40/7.
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,
36/21 = 36 × 6/21 × 6 = 216/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
72/18 = 72 × 7/18 × 7 = 504/126 - Add the two like fractions:
216/126 + 504/126 = 216 + 504/126 = 720/126 - 720/126 simplified gives 40/7
- So, 36/21 + 72/18 = 40/7
In mixed form: 55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+72/18 36/42+72/18 36/21+72/36 36/63+72/18 36/21+72/54 36/21+72/90