Answers

Add 90/24 and 20/42

1^st number: 3 18/24, 2^nd number: 20/42

90/24 + 20/42 is 355/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 24 and 42 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 24 × 7 = 168,
   90/24 = 90 × 7/24 × 7 = 630/168
3. Likewise, for the 2nd fraction, since 42 × 4 = 168,
   20/42 = 20 × 4/42 × 4 = 80/168
4. Add the two like fractions:
   630/168 + 80/168 = 630 + 80/168 = 710/168
5. 710/168 simplified gives 355/84
6. So, 90/24 + 20/42 = 355/84
   In mixed form: 419/84

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