Sign of a product of integers

Count the negative factors. An even number of negatives gives a positive product.

1. Without working it out, is the product (−1) × (−8) positive or negative? Write positive or negative.
2. Without working it out, is the product 9 × 5 positive or negative? Write positive or negative.
3. Without working it out, is the product (−1) × (−5) positive or negative? Write positive or negative.
4. Without working it out, is the product 7 × (−2) positive or negative? Write positive or negative.
5. Without working it out, is the product 6 × (−3) × 6 positive or negative? Write positive or negative.
6. Without working it out, is the product (−5) × 6 × (−3) positive or negative? Write positive or negative.
7. Without working it out, is the product 7 × (−6) × (−9) positive or negative? Write positive or negative.
8. Without working it out, is the product (−1) × (−9) positive or negative? Write positive or negative.
9. Without working it out, is the product 10 × 3 × 9 positive or negative? Write positive or negative.
10. Without working it out, is the product (−2) × 6 × (−2) × (−1) positive or negative? Write positive or negative.
11. Without working it out, is the product (−1) × 10 × (−7) positive or negative? Write positive or negative.
12. Without working it out, is the product 1 × 6 × (−5) × 3 positive or negative? Write positive or negative.
13. Without working it out, is the product (−13) × 14 × 2 positive or negative? Write positive or negative.
14. Without working it out, is the product 10 × (−5) × (−8) × 7 × 12 positive or negative? Write positive or negative.
15. Without working it out, is the product 9 × (−8) × 12 × 20 positive or negative? Write positive or negative.
16. Without working it out, is the product (−6) × (−14) × (−10) × (−20) positive or negative? Write positive or negative.
17. Without working it out, is the product 40 × (−15) × 20 × (−29) × 9 positive or negative? Write positive or negative.
18. Without working it out, is the product 34 × 7 × (−32) × 50 × (−43) × (−15) positive or negative? Write positive or negative.
19. Without working it out, is the product (−11) × (−44) positive or negative? Write positive or negative.
20. Without working it out, is the product 18 × (−50) × 8 × 44 × 48 positive or negative? Write positive or negative.