# Prime Numbers

Directions: Use the digits 1 to 9, at most one time each, to make 5 prime numbers.

### Hint

What numbers should not go in the one’s place?
What are the single digit prime numbers?

Number of Unique Solutions: 8
1:  2, 41, 53, 67, 89
2:  2, 41, 59, 67, 83
3:  2, 47, 53, 61, 89
4:  2, 47, 59, 61, 83
5:  5, 23, 41, 67, 89
6:  5, 23, 47, 61, 89
7:  5, 29, 41, 67, 83
8:  5, 29, 47, 61, 83

Source: Owen Kaplinsky

## Product Close to 1,000

Directions: Using the digits 1 to 9 at most one time each, place a digit …

1. 7,17,13,37,47

2. 5, 61, 23, 47, 89

3. 3, 11, 13, 17, and 19 are all prime.

4. 7 17 13 37 47

5. 7, 17, 13, 19, 37.

6. 0,23,41,57,89

7. 7,56,83,41,29

8. 1, 23, 46, 57, 89

9. 1: 2, 41, 53, 67, 89
2: 2, 41, 59, 67, 83
3: 2, 47, 53, 61, 89
4: 2, 47, 59, 61, 83
5: 5, 23, 41, 67, 89
6: 5, 23, 47, 61, 89
7: 5, 29, 41, 67, 83
8: 5, 29, 47, 61, 83

10. Prime numbers I can make are 5,12,6,2,and 67

11. The prime numbers I found are 5,29,47,61,83.

12. I got 5,29,47,61,83

13. 2,41,89,53,67