Answers

Add 28/90 and 15/80

28/90 + 15/80 is 359/720.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 90 × 8 = 720,
   28/90 = 28 × 8/90 × 8 = 224/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   15/80 = 15 × 9/80 × 9 = 135/720
4. Add the two like fractions:
   224/720 + 135/720 = 224 + 135/720 = 359/720
5. So, 28/90 + 15/80 = 359/720

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