Optellen tot 100 zonder brug (TE + T=TE) oefening 3

72 + 20 = 63 + 10 =
84 + 10 = 75 + 10 =
69 + 30 = 78 + 20 =
65 + 20 = 86 + 10 =
64 + 30 = 85 + 10 =