...blok 2 contractwerk.gif hoofdrekenen... oefening 6

506 - 30 =
718 + 90 =
412 - 50 =
900 - 10 =
340 + 70 =
623 - 20 =
808 - 10 =
120 + 40 =
880 + 90 =
450 + 70 =