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Mathematics Flashcards

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

Read the first 6 Mathematics flashcards as text

  1. The mean of five numbers is 8. Four of the numbers are 6, 9, 7, and 10. What is the fifth number?

    Answer: 8

    Sum = 8 × 5 = 40. Known sum = 6+9+7+10 = 32. Fifth number = 40 - 32 = 8.

  2. What is the gradient of the line passing through (2, 3) and (6, 11)?

    Answer: 2

    Gradient = (11-3)/(6-2) = 8/4 = 2.

  3. Solve: 2x - 3 = x + 5

    Answer: 8

    2x - x = 5 + 3, so x = 8.

  4. A cylinder has radius 7 cm and height 10 cm. What is its volume? (Use π ≈ 22/7)

    Answer: 1540 cm³

    Volume = πr²h = (22/7) × 49 × 10 = 22 × 7 × 10 = 1540 cm³.

  5. Express 0.000045 in standard form.

    Answer: 4.5 × 10⁻⁵

    0.000045 = 4.5 × 10⁻⁵ (move decimal 5 places to the right).

  6. If y is directly proportional to x, and y = 12 when x = 4, find y when x = 7.

    Answer: 21

    y = kx. From y=12, x=4: k = 3. When x=7: y = 3×7 = 21.

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