Answers

Add 45/12 and 48/40

1^st number: 3 9/12, 2^nd number: 1 8/40

45/12 + 48/40 is 99/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 40 is 120
   
   Next, find the equivalent fraction of both fractional numbers with denominator 120
2. For the 1st fraction, since 12 × 10 = 120,
   45/12 = 45 × 10/12 × 10 = 450/120
3. Likewise, for the 2nd fraction, since 40 × 3 = 120,
   48/40 = 48 × 3/40 × 3 = 144/120
4. Add the two like fractions:
   450/120 + 144/120 = 450 + 144/120 = 594/120
5. 594/120 simplified gives 99/20
6. So, 45/12 + 48/40 = 99/20
   In mixed form: 419/20

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