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If 15² is viewed as (10+5)², what is the area of the large square?

Answer and explanation

Correct answer: 100

The correct answer is C, 100. In the area model for (10+5)², the large square has side length 10, because the first part of each side is 10. The area of this large square is therefore 10 × 10 = 10² = 100. The complete model also contains a smaller 5-by-5 square with area 25 and two 10-by-5 rectangles, each with area 50. Option A, 25, is the area of the small square, not the large one. Option B, 50, is the area of one rectangle, not the large square. Option D, 150, is not the area of any single component in this model and comes from confusing the pieces. The total area is 225, which is 15², but the question asks only for the large square. Memory cue: identify the requested region first; the large square uses side 10, so calculate 10².

Related tags

Algebraic IdentitiesLarge SquareArea ModelVisual ModelsVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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