calcul mental 57a
18 + 18 = ( 10 + 10 ) + ( 8 + 8 ) = + =
2 x 18 = ( 2 x 10 ) + ( 2 x 8 ) = + =
calcul mental 57b
2 x 27 = ( 2 x 20 ) + ( x ) = + =

 

2 x 15 =
2 x 33 =
= 2 x 60
54 x 2 =
17 x 2 =
2 x 45 =
= 80 x 2
63 x 2 =
2 x 21 =
29 x 2 =
= 2 x 90
2 x 72 =

 

calcul mental 57c
10
19
29
30
59
89
           

 

40
80
85
calcul mental 57d
88
172
182

 

..... est égal à .....

calcul mental 58

= ou

6 x 8 12 x 4

4 x 12 3 x 15

10 x 6 3 x 20

8 x 9 7 x 10

16 x 4 8 x 8

2 x 12 =
3 x 18 =
4 x 25 =
6 x 12 =
4 x 6 =
6 x 9 =
2 x 50 =
3 x 24 =
8 x 3 =
9 x 6 =
1 x 100 =
9 x 8 =

 

< = >
7 x 8 3 x 16
8 x 8 16 x 5
15 x 3 13 x 5
10 x 9 5 x 18
6 x 7 14 x 3
19 x 9 9 x 19