Add 72/21 and 72/54
1st number: 3 9/21, 2nd number: 1 18/54
72/21 + 72/54 is 100/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
72/21 = 72 × 18/21 × 18 = 1296/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
72/54 = 72 × 7/54 × 7 = 504/378 - Add the two like fractions:
1296/378 + 504/378 = 1296 + 504/378 = 1800/378 - 1800/378 simplified gives 100/21
- So, 72/21 + 72/54 = 100/21
In mixed form: 416/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+72/54 72/63+72/54