10 + 10 = ? - 10 + 10 = 20, 30 + 40 = ? - 30 + 40 = 70, 70 + 20 = ? - 70 + 20 = 90, 50 + 50= ? - 50 + 50 = 100, 60 - 30 = ? - 60 - 30 = 30, 100 - 80 = ? - 100 - 80 = 20, 100 - 100 = ? - 100 - 100 = 0, 60 + 20 = ? - 60 + 20 = 80, 50 + 40 = ? - 50 + 40 = 90,

Сабирање и одузимање десетица

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