Answers

Add 90/18 and 42/80

1^st number: 5 0/18, 2^nd number: 42/80

90/18 + 42/80 is 221/40.

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,
   90/18 = 90 × 40/18 × 40 = 3600/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   42/80 = 42 × 9/80 × 9 = 378/720
4. Add the two like fractions:
   3600/720 + 378/720 = 3600 + 378/720 = 3978/720
5. 3978/720 simplified gives 221/40
6. So, 90/18 + 42/80 = 221/40
   In mixed form: 521/40

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