Aftrekken tot 100 zonder brug (TE - T = TE) oefening 4

79 - 30 =
65 - 50 =
99 - 80 =
88 - 20 =
97 - 50 =
67 - 30 =
86 - 60 =
73 - 70 =
93 - 70 =
75 - 40 =