Add 90/72 and 36/28
1st number: 1 18/72, 2nd number: 1 8/28
90/72 + 36/28 is 71/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 28 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
90/72 = 90 × 7/72 × 7 = 630/504 - Likewise, for the 2nd fraction, since 28 × 18 = 504,
36/28 = 36 × 18/28 × 18 = 648/504 - Add the two like fractions:
630/504 + 648/504 = 630 + 648/504 = 1278/504 - 1278/504 simplified gives 71/28
- So, 90/72 + 36/28 = 71/28
In mixed form: 215/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/72+72/28 90/72+36/56 90/72+36/84