Answers Objective Assessment- 4 1. c) 2 x 3 x 5 2. c) 19 3. 2 x 5 x 7 4. c) 2 x 3 x 5 5. d) All of these are possible ways to start 1,000's factor tree. 6. 7, 13, and 19 7. 3 × 3 × 3 × 3 8. (a) 2 × 2 × 2 × 2 × 2 × 3