alleryWhat is the cube of negative 3?
- -27
- 27
- -9
- 9
Show answer and solution
Correct answer: A. -27
The cube function is odd, so (-3) cubed equals minus 27.
GRE Number System — practice questions
Explore 3 free Number System questions in GRE Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–3 of 3.
Worked practice questions
The difference between 7 squared and 6 squared equals which number?
- 13
- 11
- 12
- 14
Show answer and solution
Correct answer: A. 13
The difference n squared minus (n-1) squared equals 2n minus 1, so for n = 7 it is 13.
Which of these numbers is a perfect cube?
- 36
- 27
- 18
- 30
Show answer and solution
Correct answer: B. 27
27 equals 3 x 3 x 3, so it is the cube of an integer.
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