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Question

The value of $(0.2)^3 - (0.02)^3$ is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
0.007992

The question asks for the value of the expression $(0.2)^3 - (0.02)^3$. We need to calculate the cubes of the two decimal numbers and then find their difference.

Calculation Steps for $(0.2)^3 - (0.02)^3$

  1. Calculate the first term: $(0.2)^3$ This means multiplying 0.2 by itself three times: $0.2 \times 0.2 \times 0.2 = 0.04 \times 0.2 = 0.008$
  2. Calculate the second term: $(0.02)^3$ This means multiplying 0.02 by itself three times: $0.02 \times 0.02 \times 0.02 = 0.0004 \times 0.02 = 0.000008$
  3. Subtract the second term from the first term: We need to calculate $0.008 - 0.000008$. To subtract, align the decimal points and add trailing zeros to the first number:

    $0.008000$
    $- 0.000008$
    ----------
    $0.007992$

    So, $(0.2)^3 - (0.02)^3 = 0.007992$.

The calculated value is 0.007992, which matches one of the given options.

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