30 + 60 =, 10 + 80 =, 70 + 20 =, 80 – 50 =, 40 + 50 =, 90 – 30 =, 10 + 60 =, 100 – 20 =, 30 + 40 =, 60 – 10 =, 50 + 50 =, 100 – 40 =, 50 + 30 =, 40 + 40 =, 50 – 20 =, 90 – 40 =, 70 – 60 =, 70 – 10 =, 20 + 30 =, 100 – 70 =.
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Сабирање и одузимање десетица
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Ivanicas15
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