56 - 30 =
100 - = 30
7 + [?] = 30
50 + [?] = 79
[?] + 40 = 60
52 + 6 =
46 - [?] = 41
78 - 40 =
33 + [?] = 59
45 - 23 =

De som van 53 en 7 is [?]
Het verschil tussen 100 en 20 is [?]
7 minder dan 80 is [?]
16 meer dan 40 is [?]
60 en 4 is samen [?]