PSLE Mathematics Problem Solving 2

Question 1

A train travels at 80 km/h. How far will it travel in 2 hours and 30 minutes?

Accepted Answer

200 km

Answer

2 hours 30 minutes = 2.5 hours. Distance = speed × time = 80 × 2.5 = 200 km.

Question 2

A tank is 3/4 full of water. After 15 litres are added, it becomes completely full. What is the total capacity of the tank?

Accepted Answer

60 litres

Answer

If 3/4 is full, then 1/4 is empty. 1/4 of capacity = 15 litres. Total capacity = 15 × 4 = 60 litres.

Question 3

There are 450 students in a school. 2/5 of them are boys. How many girls are there?

Accepted Answer

270

Answer

Boys: 2/5 × 450 = 180. Girls: 450 − 180 = 270.

Question 4

A piece of rope is 3.6 m long. It is cut into pieces of 0.4 m each. How many pieces are there?

Accepted Answer

9

Answer

3.6 ÷ 0.4 = 9 pieces.

Question 5

Ali scored 75, 82, 68, 91, and 84 on five tests. What is his average score?

Accepted Answer

80

Answer

Sum = 75 + 82 + 68 + 91 + 84 = 400. Average = 400 ÷ 5 = 80.

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