MEGA Elementary Education Multi-Content Practice Test

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Prepare for the MEGA Elementary Education Test. Study with multiple choice questions and flashcards, complete with hints and explanations. Ace your exam!

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Practice this question and more.

What is the value closest to 2.5 x 10^(-2)?

0.021
2.3
2/10
22/100

The correct answer is: 0.021

The expression 2.5 x 10^(-2) represents a number in scientific notation. In this case, the power of ten indicates how many places the decimal point should move. Since the exponent is -2, you would move the decimal point two places to the left from 2.5. Starting with 2.5, moving the decimal left two places transforms it into 0.025. However, if we re-evaluate the options provided and look for the closest value to 0.025: The first choice, 0.021, is the closest approximation to 0.025 when compared to the other options. The second choice, 2.3, represents a much larger number than what we're evaluating. The fraction options, 2/10 (which equals 0.2) and 22/100 (which equals 0.22), are also significantly farther from 0.025 than 0.021 is. Thus, 0.021 is indeed the closest value to 2.5 x 10^(-2).