[ Odejmowanie w zakresie 20 ]
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Odejmij najpierw do pełnej dziesiątki,
a potem resztę (jak w przykładzie)
17 – 9 = 17 – 7 – 2 = 10 – 2 = 8
13 – 6 = ........................ = .................. = ...........
16 – 8 = ........................ = .................. = ...........
12 – 3 = ........................ = .................. = ...........
15 – 9 = ........................ = .................. = ...........
18 – 9 = ........................ = .................. = ...........
11 – 5 = ........................ = .................. = ...........
14 – 9 = ........................ = .................. = ...........