...blok 1 contractwerk.gif hoofdrekenen... oefening 9

18 + 19 =
34 - 18 =
56 - 28 =
34 - 28 =
47 + 25 =
59 + 41 =
74 + 34 =
91 - 16 =
66 + 56 =
94 + 16 =