Answers

Add 21/15 and 72/63

1^st number: 1 6/15, 2^nd number: 1 9/63

21/15 + 72/63 is 89/35.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 63 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 15 × 21 = 315,
   21/15 = 21 × 21/15 × 21 = 441/315
3. Likewise, for the 2nd fraction, since 63 × 5 = 315,
   72/63 = 72 × 5/63 × 5 = 360/315
4. Add the two like fractions:
   441/315 + 360/315 = 441 + 360/315 = 801/315
5. 801/315 simplified gives 89/35
6. So, 21/15 + 72/63 = 89/35
   In mixed form: 219/35

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