OCR Document

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1 20. , 20 . 10. (, , , ..., ) (, , ..., ). 6 1 (.. 1 6 + 4 ..). , 1 (4 + 6 = 6 + 4). 10. , 10. 1 6 1 . 1 (1 + 9 = 10, 2 + 8 = 10, 3 + 7 = 10, 4 + 6 = 10 5 + 5 = 10) . . , lego .. 10. , . . . 1, , , . , , , . . :. .. .. .. ' (.. 2 ) (.. ).

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