This document contains a series of math problems involving negative numbers and their solutions. It presents 5 problems - multiplying and dividing numbers with negative values. The corrections provided show multiplying or dividing negative numbers results in a negative value, while multiplying a negative number an even number of times or dividing a negative number results in a positive value.

1. Calcul mental
“Les nombres relatifs”
Série n°3

2. Diapositive 1
18 x (-0,1)

4. Diapositive 2
-12 x (-0,5)

6. Diapositive 3
-25 x (-9) x (-4)

8. Diapositive 4
- 59 : (-10)

10. Diapositive 5
55 : (-5)

12. CORRECTION

13. FIN

14. Diapositive 1
18 x (-0,1)
= -1,8

15. Diapositive 2
-12 x (-0,5)
= 6

16. Diapositive 3
-25 x (-9) x (-4)
= -900

17. Diapositive 4
- 59 : (-10)
= 5,9

18. Diapositive 5
55 : (-5)
= -11