Nombre de sachets : Nombre de billes par sachet : Nombre total de billes : On peut écrire :
2
7
 
2 x 7 =
7 x 2 =
3
7
3 x 7 =
7 x =
5
7
x =
x =
8
7
x =
x =

 

6 x 4 = 3 x 5 = 2 x 9 = 4 x 9 =
6 x 5 = 5 x 5 = 4 x 9 = 3 x 9 =
6 x 9 = 8 x 5 = 6 x 9 = 7 x 9 =

 

x
1
5
2
7
x
0
3
6
9
x
2
4
5
10
4
 
 
 
 
8
 
 
 
 
3
 
 
 
 
8
 
 
 
 
9
 
 
 
 
6
 
 
 
 

 

calculmental49a
calculmental49b
calculmental49c
4 x 3 = 3 x =     2 x =  x =     1 x =   x 1 =  

 

calculmental49e
calculmental49e
calculmental49f
x
=
x
=
x
=
x
=
 
x
=
x
=

 

48 = 2 x =  x   1 x = 36    x 2 = 60
48 =  x 6 =   x   2 x = 36     x 4 = 60
48 = 4 x =   x   3 x = 36   20 x = 60
48 = 3 x =   x     x 9 = 36     x 60 = 60
48 =   x 48 =   x 1   36 x = 36   6 x = 60
              x 6 = 36     x 5 = 60
            12 x = 36   15 x = 60