Answers

Add 20/21 and 45/27

1^st number: 20/21, 2^nd number: 1 18/27

20/21 + 45/27 is 55/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   20/21 = 20 × 9/21 × 9 = 180/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   45/27 = 45 × 7/27 × 7 = 315/189
4. Add the two like fractions:
   180/189 + 315/189 = 180 + 315/189 = 495/189
5. 495/189 simplified gives 55/21
6. So, 20/21 + 45/27 = 55/21
   In mixed form: 213/21

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