Problem (Page 88). In a group of nine coins, eight weigh the same ...
Problem (Page 88). In a group of nine coins, eight weigh the same ...
Problem (Page 88). In a group of nine coins, eight weigh the same ...
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32 3. WHOLE NUMBERS: OPERATIONS AND PROPERTIES(1) Commutativity – once <strong>the</strong> lower left <strong>of</strong> <strong>the</strong> table is completer, <strong>the</strong> upperright is obtained by commutativity.(2) Adding zero –using a + 0 = a fills <strong>the</strong> leftmost column.(3) Counting on by 1 and 2 – e.g., for 7 + 1, 7 + 2, think 7, 8, 9. This gives <strong>the</strong>next two columns.
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