Civil Service Exam Reviewer · Basic Operations · hard

Evaluate: 25 × 27 ÷ 28

  1. 16
  2. 134,217,728
  3. 1,048,576
  4. 32

Answer

A. 16

Solution

Same base: add exponents when multiplying, subtract when dividing: 2(5 + 7 − 8) = 24 = 16.

More Basic Operations questions

  1. Which of the following fractions is the SMALLEST: 9/10, 3/4, 2/3, 7/11?
  2. Which of the following fractions is the LARGEST: 4/7, 1/3, 3/4, 8/9?
  3. Express 0.9444… (only the 4 repeats) as a fraction in lowest terms.
  4. Express the repeating decimal 0.747474… as a fraction in lowest terms.
  5. Evaluate: 48 − [49 − (3 × 9 − 18)] ÷ 5
  6. Two school bells ring every 5 and 25 minutes, respectively. If they ring together at 8:00 AM, when will they next ring together?
  7. Evaluate: (−4)³ − (−2)² + 8
  8. Multiply: (7 × 102) × (3 × 104). Express in scientific notation.
  9. Evaluate: 2.5 × 1/2 + 0.5 ÷ 7/8
  10. Evaluate: 24 × 22 ÷ 25

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