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Arithmetic and Number Properties Flashcards

7 cards from real GRE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Arithmetic and Number Properties flashcards as text

  1. If |x - 4| = 6, what are the possible values of x?

    Answer: 10 and -2

    x - 4 = 6 gives x = 10, and x - 4 = -6 gives x = -2.

  2. What is the value of 5! / 3!?

    Answer: 20

    5!/3! = 5·4 = 20.

  3. If n is divisible by both 4 and 6, then n must be divisible by which number?

    Answer: 12

    The LCM of 4 and 6 is 12, so n must be divisible by 12.

  4. What is the reciprocal of 2/3 divided by 4?

    Answer: 3/8

    The reciprocal of 2/3 is 3/2, and 3/2 ÷ 4 = 3/8.

  5. Which of the following is an irrational number?

    Answer: √2

    √2 cannot be written as a ratio of integers, so it is irrational.

  6. If the average of 5 numbers is 12, what is their sum?

    Answer: 60

    Sum = average × count = 12 × 5 = 60.

  7. What is the units digit of the product 13 × 27 × 45?

    Answer: 5

    The units digits are 3, 7, 5; 3×7=21 (units 1), then 1×5=5.