Activités mentales 3

Prêt

Question 1

Calculez -21- (-6) x 8

Question 2

Calculez -100 – (- 68)

Question 3

(-6)2

Question 4

- 34

Question 5

Calculez 106

Question 6

Calculez 9 - 2 10 5

Question 7

Calculez les 5 de 100 4

Question 8

Quel nombre convient?

… : 9 = -7

Question 9

Calculez 50 : 0,5

Question 10

Trouvez x tel que x = 7 2 10

Correction

1) –21 – ( -6 ) x 8 =-21 +48=27

2) –100 –( -68) = -100+68 = -32

3) (-6)2 =36

4) – 34 = - 3x 3x 3x 3 =-81

5) 106 = 1 000 000

6) 9 - 2 = 9 - 4 = 5 = 1 10 5 10 5 10 2

7)Les 5 de 100= 5 x 100 =5x 25 4 4 =125

8) –63 car –63 : 9 = -7

9) 50 : 0,5 = 50 : 1 = 50 x 2 = 100 2ou 500 : 5 = 100

10) x = 72 1010 x x = 7 x 2 10 x x = 14x = 14 = 1,4 10