Correct: 15 - 7 = 8, 12 + 6 =18, 9 + 6 = 15, 16 - 7 =9, 6 + 6 = 12, 13 - 5 =8, 14 - 6 = 8, 7 + 4 = 11, 8 + 7 = 15, 18 - 8 = 10, 6 + 9 = 15 , 9 + 8 = 17, Incorrect: 15 - 7 = 9, 20 - 9=12, 9 + 6 = 13, 7 + 4 = 10, 6 + 6 = 14, 8 + 7 = 16, 9 + 8 = 18, 16 - 7 =8, 13 - 5 = 9, 14 - 6 = 7, 17 - 9 = 9, 15 - 8 = 6,

Сабирање и одузимање до 20

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