Multiplier par 10,100,1 000,20,200,2 000
x10 = on ajoute un 0
57x10=570
x100 = on ajoute deux 0
57x 100 = 5 700
1 000 = on ajoute trois 0
57x1 000 = 57 000
x 20 = 24x20 = 480
24x20 = ( 24x 10 ) + (24x 10 )
240 + 240 = 480
x 200
12 x 200 = 2 400
x2 000
86 x 2 000 = 172 000
30 x 500 = 1 500
30 x 1 000 = 30 000
30 000 : 2 = 15 000
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