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Mathematics Problem Solving 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.

Read the first 6 Mathematics Problem Solving flashcards as text

  1. A bag has 4 red, 6 blue, and 5 green marbles. What is the probability of picking a blue marble?

    Answer: 6/15

    Total marbles = 4 + 6 + 5 = 15. Probability of blue = 6/15 = 2/5.

  2. A rectangular piece of cardboard is 30 cm by 20 cm. A square of side 4 cm is cut from each corner. What is the remaining area?

    Answer: 536 cm²

    Original area: 30 × 20 = 600 cm². Area of 4 squares: 4 × (4 × 4) = 64 cm². Remaining: 600 − 64 = 536 cm².

  3. At 9:00 a.m., a tank is 1/3 full. Water flows in at 5 litres per minute. At 9:24 a.m., the tank is completely full. What is the tank's capacity?

    Answer: 180 litres

    Time = 24 minutes. Water added = 5 × 24 = 120 litres fills 2/3 of the tank. Capacity = 120 × 3/2 = 180 litres.

  4. Ravi walks at 4 km/h and Sam walks at 6 km/h. They start from the same point walking in opposite directions. How far apart are they after 1.5 hours?

    Answer: 15 km

    Combined speed = 4 + 6 = 10 km/h. Distance apart after 1.5 hours = 10 × 1.5 = 15 km.

  5. A number when divided by 7 gives a quotient of 13 and a remainder of 4. What is the number?

    Answer: 95

    Number = (Divisor × Quotient) + Remainder = (7 × 13) + 4 = 91 + 4 = 95.

  6. A school hall can seat 35 rows of 28 chairs each. For a concert, 12 chairs from each row are removed for the stage. How many chairs remain?

    Answer: 560

    Original chairs: 35 × 28 = 980. Removed: 35 × 12 = 420. Remaining: 980 − 420 = 560.

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