Answers

Add 45/3 and 42/21

1^st number: 15 0/3, 2^nd number: 2 0/21

45/3 + 42/21 is 17/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 3 and 21 is 21
   
   Next, find the equivalent fraction of both fractional numbers with denominator 21
2. For the 1st fraction, since 3 × 7 = 21,
   45/3 = 45 × 7/3 × 7 = 315/21
3. Likewise, for the 2nd fraction, since 21 × 1 = 21,
   42/21 = 42 × 1/21 × 1 = 42/21
4. Add the two like fractions:
   315/21 + 42/21 = 315 + 42/21 = 357/21
5. 357/21 simplified gives 17/1
6. So, 45/3 + 42/21 = 17/1

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