MEGA Elementary Education Multi-Content Practice Test

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Study for the MEGA Elementary Education Test. Engage with flashcards and multiple choice questions, each question includes hints and explanations. Prepare effectively for your exam!

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).