Answers

Add 28/90 and 80/72

1^st number: 28/90, 2^nd number: 1 8/72

28/90 + 80/72 is 64/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 90 × 4 = 360,
   28/90 = 28 × 4/90 × 4 = 112/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   80/72 = 80 × 5/72 × 5 = 400/360
4. Add the two like fractions:
   112/360 + 400/360 = 112 + 400/360 = 512/360
5. 512/360 simplified gives 64/45
6. So, 28/90 + 80/72 = 64/45
   In mixed form: 119/45

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