Answers

Add 63/28 and 15/40

1^st number: 2 7/28, 2^nd number: 15/40

63/28 + 15/40 is 21/8.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 40 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 28 × 10 = 280,
   63/28 = 63 × 10/28 × 10 = 630/280
3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
   15/40 = 15 × 7/40 × 7 = 105/280
4. Add the two like fractions:
   630/280 + 105/280 = 630 + 105/280 = 735/280
5. 735/280 simplified gives 21/8
6. So, 63/28 + 15/40 = 21/8
   In mixed form: 25/8

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