Optellen tot 100 zonder brug (TE + T=TE) oefening 4

66 + 10 = 76 + 10 =
56 + 30 = 67 + 20 =
47 + 20 = 61 + 30 =
83 + 10 = 62 + 10 =
54 + 20 = 49 + 30 =