Answers

Add 42/12 and 63/90

1^st number: 3 6/12, 2^nd number: 63/90

42/12 + 63/90 is 21/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 12 × 15 = 180,
   42/12 = 42 × 15/12 × 15 = 630/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   63/90 = 63 × 2/90 × 2 = 126/180
4. Add the two like fractions:
   630/180 + 126/180 = 630 + 126/180 = 756/180
5. 756/180 simplified gives 21/5
6. So, 42/12 + 63/90 = 21/5
   In mixed form: 41/5

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