Answers

Add 54/15 and 63/40

1^st number: 3 9/15, 2^nd number: 1 23/40

54/15 + 63/40 is 207/40.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 15 × 8 = 120,
   54/15 = 54 × 8/15 × 8 = 432/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   63/40 = 63 × 3/40 × 3 = 189/120
4. Add the two like fractions:
   432/120 + 189/120 = 432 + 189/120 = 621/120
5. 621/120 simplified gives 207/40
6. So, 54/15 + 63/40 = 207/40
   In mixed form: 57/40

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