x10 -> On ajoute un 0
Ex: 57x10 = 570
x100 -> On ajoute deux 0
Ex: 57x100 = 5700
x1000 -> On ajoute trois 0
Ex: 57x1000 = 57 000
x20
24x20 = 480
24x20 = (24x10) + (24x10)
240+240 = 480
x200
12x200 = 2 400
12x200 = (12x100) + (12x100)
=1200 + 1200
=2 400
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