Answers

Add 15/28 and 42/40

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

15/28 + 42/40 is 111/70.

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,
   15/28 = 15 × 10/28 × 10 = 150/280
3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
   42/40 = 42 × 7/40 × 7 = 294/280
4. Add the two like fractions:
   150/280 + 294/280 = 150 + 294/280 = 444/280
5. 444/280 simplified gives 111/70
6. So, 15/28 + 42/40 = 111/70
   In mixed form: 141/70

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