Answers

Add 84/63 and 15/40

1^st number: 1 21/63, 2^nd number: 15/40

84/63 + 15/40 is 41/24.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 40 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 63 × 40 = 2520,
   84/63 = 84 × 40/63 × 40 = 3360/2520
3. Likewise, for the 2nd fraction, since 40 × 63 = 2520,
   15/40 = 15 × 63/40 × 63 = 945/2520
4. Add the two like fractions:
   3360/2520 + 945/2520 = 3360 + 945/2520 = 4305/2520
5. 4305/2520 simplified gives 41/24
6. So, 84/63 + 15/40 = 41/24
   In mixed form: 117/24

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