...blok 1 contractwerk.gif hoofdrekenen... oefening 10

200 + 400 =
102 - 100 =
315 + 500 =
850 + 300 =
405 + 600 =
764 - 300 =
950 - 500 =
975 + 300 =
1 100 - 200 =
607 + 700 =