Area 3.MD.5-7 Practice Question Grade 3 Mathematics - Skill Builder + New York State Test (NYST) Rehearsal

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Consider two rectangles with dimensions 8 cm x 7 cm and 8 cm x 5 cm placed one above the other (as shown in the figure below).
Find the areas of the rectangles A, B and the big rectangle (formed by A and B), and show that the area of the big rectangle is equal to the sum of the areas of the two rectangles A and B. Which property is illustrated in this example. Write your answer in the box below.