A rectangle has an area of 20 square units. What are its possible dimensions? List as many different dimensions as you can in multiplication sentences. Is 20 a prime or composite number? How do you know? Explain how you arrived at your answers in sentences below.
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Answer:
20 = 2×2×5
Possible dimensions = 1×20, 20×1, 2×10, 10×2, 4×5, 5×4
20 is a composite number because it has more factors other than 20 and 1
I arrived at my answers through looking through the prime factors of 20
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