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Which form is most useful to find ( 1002^2 )?

Answer and explanation

Correct answer: ( (1000+2)^2 )

The number 1002 is very close to the simple number 1000, so the most useful rewrite is \\(1002=1000+2\\). Hence \\(1002^2=(1000+2)^2\\). Using \\((a+b)^2=a^2+2ab+b^2\\), this can be calculated as \\(1000^2+2(1000)(2)+2^2=1,000,000+4,000+4=1,004,004\\). The question asks for the useful form, not merely the final numerical value.

Therefore option A is correct. The form \\(1000-2\\) represents 998, not 1002, so option B is unsuitable. Similarly, \\(100+2\\) is 102 and \\(10+2\\) is 12; their squares are different numbers. The key strategy is to express a number near a convenient base and then apply the square identity. This reduces long multiplication and lowers the chance of calculation errors.

Related tags

Numeric IdentitySquare MethodEasy Calculation

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