Събиране и изваждане на числата до 20 без преминаване
1 клас
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12+5=answers16181720
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14+2=answers15191816
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16+3=answers19131720
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15-3=answers10141213
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19-4=answers14152017
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17-6=answers13151211
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18-15=answers6937
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12-10=answers2016
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20-10=answers102012
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