Answers

Add 42/40 and 18/80

1^st number: 1 2/40, 2^nd number: 18/80

42/40 + 18/80 is 51/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 80 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 40 × 2 = 80,
   42/40 = 42 × 2/40 × 2 = 84/80
3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
   18/80 = 18 × 1/80 × 1 = 18/80
4. Add the two like fractions:
   84/80 + 18/80 = 84 + 18/80 = 102/80
5. 102/80 simplified gives 51/40
6. So, 42/40 + 18/80 = 51/40
   In mixed form: 111/40

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