Answers

Add 45/21 and 63/15

1^st number: 2 3/21, 2^nd number: 4 3/15

45/21 + 63/15 is 222/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 15 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 21 × 5 = 105,
   45/21 = 45 × 5/21 × 5 = 225/105
3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
   63/15 = 63 × 7/15 × 7 = 441/105
4. Add the two like fractions:
   225/105 + 441/105 = 225 + 441/105 = 666/105
5. 666/105 simplified gives 222/35
6. So, 45/21 + 63/15 = 222/35
   In mixed form: 612/35

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