Answers

Add 10/18 and 21/80

10/18 + 21/80 is 589/720.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 18 × 40 = 720,
   10/18 = 10 × 40/18 × 40 = 400/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   21/80 = 21 × 9/80 × 9 = 189/720
4. Add the two like fractions:
   400/720 + 189/720 = 400 + 189/720 = 589/720
5. So, 10/18 + 21/80 = 589/720

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