Answers

Add 15/42 and 48/40

1^st number: 15/42, 2^nd number: 1 8/40

15/42 + 48/40 is 109/70.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 42 × 20 = 840,
   15/42 = 15 × 20/42 × 20 = 300/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   48/40 = 48 × 21/40 × 21 = 1008/840
4. Add the two like fractions:
   300/840 + 1008/840 = 300 + 1008/840 = 1308/840
5. 1308/840 simplified gives 109/70
6. So, 15/42 + 48/40 = 109/70
   In mixed form: 139/70

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