Add 72/28 and 90/54
1st number: 2 16/28, 2nd number: 1 36/54
72/28 + 90/54 is 89/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 54 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 28 × 27 = 756,
72/28 = 72 × 27/28 × 27 = 1944/756 - Likewise, for the 2nd fraction, since 54 × 14 = 756,
90/54 = 90 × 14/54 × 14 = 1260/756 - Add the two like fractions:
1944/756 + 1260/756 = 1944 + 1260/756 = 3204/756 - 3204/756 simplified gives 89/21
- So, 72/28 + 90/54 = 89/21
In mixed form: 45/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/56+90/54 72/84+90/54