What is the square of 144?

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A 20736
B 20376
C 27306
D 23076

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Answer: A. 20736

Write 144 as 140 + 4 and use (a + b)^2 = a^2 + 2ab + b^2: 140^2 = 19600, 2 x 140 x 4 = 1120 and 4^2 = 16. Adding, 19600 + 1120 + 16 = 20736.

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What is the square of 144?

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