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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. Solve for x: 3x + 7 = 22

    Answer: 5

    3x = 22 - 7 = 15, so x = 15 ÷ 3 = 5.

  2. What is the value of 2³ × 4?

    Answer: 32

    2³ = 8, and 8 × 4 = 32.

  3. Factorise: x² - 9

    Answer: (x+3)(x-3)

    x² - 9 is a difference of two squares: (x+3)(x-3).

  4. A rectangle has length 12 cm and width 5 cm. What is its area?

    Answer: 60 cm²

    Area = length × width = 12 × 5 = 60 cm².

  5. What is 15% of 200?

    Answer: 30

    15% of 200 = (15/100) × 200 = 30.

  6. Simplify: (3x²y)(2xy³)

    Answer: 6x³y⁴

    Multiply coefficients: 3×2=6. Add exponents: x²·x=x³, y·y³=y⁴. Result: 6x³y⁴.

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Sources & references

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  1. file.go.gov.sg — Retake policy · verified Nov 2026
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