Answers

Add 45/9 and 42/21

1^st number: 5 0/9, 2^nd number: 2 0/21

45/9 + 42/21 is 7/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 21 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 9 × 7 = 63,
   45/9 = 45 × 7/9 × 7 = 315/63
3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
   42/21 = 42 × 3/21 × 3 = 126/63
4. Add the two like fractions:
   315/63 + 126/63 = 315 + 126/63 = 441/63
5. 441/63 simplified gives 7/1
6. So, 45/9 + 42/21 = 7/1

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