1. Section 3.11

2. Not what I had in mind. Section 3.12

3. 3

4. NumberX1X2X3X4X5X6X7 7 10 Section 3.14

5. 100 would be divisible by 4, but 102 doesn’t work. Section 3.15

6. Prime and Composite Numbers A natural number that has exactly two different factors is called a prime number.  The number 1 is not prime  A natural number, other than 1, that is not prime is composite. Section 3.16

7. 7 Every number has just one (unique) prime factorization.

8. Section 3.18

9. Homework: 31 and 35 – you must justify how you got your answer (explain in words or show work) 37 and 43 – you must justify how you got your answer (explain in words or show work) 49, 53, 61, 63, 65, 73 – you must construct a factor tree, then answer by providing an equation. For example: