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Mathematics Concepts Flashcards

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

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  1. What is the perimeter of a semicircle with diameter 10 cm? (Use π = 3.14)

    Answer: 25.7 cm

    Perimeter = half circumference + diameter = (π × 10)/2 + 10 = 15.7 + 10 = 25.7 cm.

  2. What is 40% of 250?

    Answer: 100

    40% of 250 = 40/100 × 250 = 100.

  3. How many edges does a rectangular prism (cuboid) have?

    Answer: 12

    A cuboid has 12 edges: 4 along the length, 4 along the width, and 4 along the height.

  4. What is the reciprocal of 2/5?

    Answer: 5/2

    The reciprocal of a fraction is obtained by flipping the numerator and denominator. Reciprocal of 2/5 = 5/2.

  5. Express 0.004 in standard form.

    Answer: 4 × 10⁻³

    0.004 = 4 × 0.001 = 4 × 10⁻³.

  6. What kind of triangle has all three sides of different lengths?

    Answer: Scalene

    A scalene triangle has all three sides of different lengths and all three angles of different measures.

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