Procédés de calcul réfléchi

Observe l'exemple ci-dessous, puis complète.

8 x 17 = 8 x (10 + 7) = (8 x 10) + (8 x 7) = 80 + 56 = 136

Le nombre 8 doit multiplier 17.
17 = 10 + 7
Le nombre 8 multiplie donc 10 et 7
53 x 7 = ( x 7 ) + ( x 7 ) =
36 x 5 = ( x 5 ) + ( x 5 ) =
3 x 13 = ( 3 x ) + ( 3 x ) =
23 x 9 = ( x 9 ) + ( x 9 ) =
56 x 5 = ( x 5 ) + ( x 5 ) =
6 x 33 = ( 6 x ) + ( x 3 ) =
73 x 7 = ( x 7 ) + ( x 7 ) =

104 x 6 = 600 + =
14 x 8 = 80 + =
82 x 8 = 640 + =
31 x 3 = 90 + =
8 x 98 = + 64 =

8 x 95 =
203 x 6 =
6 x 75 =
4 x 95 =
306 x 7 =