...blok 2 contractwerk.gif hoofdrekenen... oefening 3

75 + 9 = 33 - 8 =
45 - 7 = 39 + 3 =
54 + 8 = 72 - 7 =
46 - 9 = 18 + 8 =
86 + 7 = 84 - 6 =