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Math: Computation and Problem-Solving Flashcards

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

Read the first 7 Math: Computation and Problem-Solving flashcards as text

  1. A school has 450 students. If 54 students are absent, what percent are absent?

    Answer: 12%

    54/450 = 0.12 = 12%.

  2. What is the least common multiple (LCM) of 8 and 12?

    Answer: 24

    The LCM of 8 and 12 is 24 because it is the smallest number divisible by both.

  3. A tank is 3/5 full. After adding 120 gallons, it is 4/5 full. What is the tank's total capacity?

    Answer: 600 gallons

    120 gallons represents 4/5 − 3/5 = 1/5 of capacity, so total = 120 × 5 = 600 gallons.

  4. If the average of five numbers is 18, and four of the numbers are 14, 16, 20, and 22, what is the fifth number?

    Answer: 18

    The total is 5 × 18 = 90; the sum of the four known numbers is 72; the fifth is 90 − 72 = 18.

  5. Which number is NOT a prime number?

    Answer: 51

    51 = 3 × 17, so it is not prime; the others have no factors other than 1 and themselves.

  6. A map has a scale of 1 inch = 25 miles. Two cities are 3.6 inches apart on the map. What is the actual distance?

    Answer: 90 miles

    3.6 × 25 = 90 miles.

  7. Simplify: (2³ × 2²) ÷ 2⁴

    Answer: 2

    2³ × 2² = 2⁵, and 2⁵ ÷ 2⁴ = 2¹ = 2.