Answers

Add 7/42 and 90/72

1^st number: 7/42, 2^nd number: 1 18/72

7/42 + 90/72 is 17/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 42 × 12 = 504,
   7/42 = 7 × 12/42 × 12 = 84/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   90/72 = 90 × 7/72 × 7 = 630/504
4. Add the two like fractions:
   84/504 + 630/504 = 84 + 630/504 = 714/504
5. 714/504 simplified gives 17/12
6. So, 7/42 + 90/72 = 17/12
   In mixed form: 15/12

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