...blok 3 contractwerk.gif hoofdrekenen... oefening 19

Voorbeeld: 200 x 68 = (2 x 68) x 100 = 136 x 100 = 13600
300 x 64 = ( x 64 ) x = x =
2 000 x 12 = ( x 12 ) x = x =
400 x 17 = ( x 17 ) x = x =
500 x 42 = ( x 42 ) x = x =
600 x 13 = ( x 13 ) x = x =