4. a. Explain how to decompose the large rectangle in Figure 12.5 into 4 groups with 5 squares in each group, so as to describe the area of the rectangles as ст I cm Explain why the area Figure 12.5 is (4-5)cm2 b. Calculate 4 S without a calculator, showing your calculations. Then verify that this calcu- lation has the same answer as when you deter- mine the area of the rectangle in Figure 12.5 by counting squares

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