Add 72/21 and 10/18
1st number: 3 9/21, 2nd number: 10/18
72/21 + 10/18 is 251/63.
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,
72/21 = 72 × 6/21 × 6 = 432/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126 - Add the two like fractions:
432/126 + 70/126 = 432 + 70/126 = 502/126 - 502/126 simplified gives 251/63
- So, 72/21 + 10/18 = 251/63
In mixed form: 362/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/21+20/18 72/42+10/18 72/21+10/36 72/21+30/18 72/63+10/18 72/21+10/54 72/21+50/18 72/21+10/90 72/21+70/18