Answers

Add 90/63 and 45/12

1^st number: 1 27/63, 2^nd number: 3 9/12

90/63 + 45/12 is 145/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 12 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 63 × 4 = 252,
   90/63 = 90 × 4/63 × 4 = 360/252
3. Likewise, for the 2nd fraction, since 12 × 21 = 252,
   45/12 = 45 × 21/12 × 21 = 945/252
4. Add the two like fractions:
   360/252 + 945/252 = 360 + 945/252 = 1305/252
5. 1305/252 simplified gives 145/28
6. So, 90/63 + 45/12 = 145/28
   In mixed form: 55/28

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