Answers

Add 45/15 and 40/42

1^st number: 3 0/15, 2^nd number: 40/42

45/15 + 40/42 is 83/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 42 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 15 × 14 = 210,
   45/15 = 45 × 14/15 × 14 = 630/210
3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
   40/42 = 40 × 5/42 × 5 = 200/210
4. Add the two like fractions:
   630/210 + 200/210 = 630 + 200/210 = 830/210
5. 830/210 simplified gives 83/21
6. So, 45/15 + 40/42 = 83/21
   In mixed form: 320/21

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