NAPLAN NAPLAN Numeracy Year 9 Practice 2

Question 1

A bag contains 5 red marbles, 3 blue marbles and 2 green marbles. If one marble is chosen at random, what is the probability of choosing a red marble?

Accepted Answer

1/2

Answer

Total marbles = 10. P(red) = 5/10 = 1/2

Question 2

A sequence of figures is made with matchsticks: Figure 1 uses 4, Figure 2 uses 7, Figure 3 uses 10. How many matchsticks are needed for Figure 8?

Accepted Answer

25

Answer

Rule: 3n + 1. Figure 8 = 3(8) + 1 = 25

Question 3

A car travels 360 km using 45 litres of petrol. What is the car's fuel efficiency in kilometres per litre?

Accepted Answer

8 km/L

Answer

Fuel efficiency = 360 ÷ 45 = 8 km/L

Question 4

A stem-and-leaf plot shows quiz scores:
Stem 5: leaves 2 4 7
Stem 6: leaves 1 3 3 8
Stem 7: leaves 0 5 9
Stem 8: leaves 2 6
What is the median score?

Accepted Answer

65

Answer

12 values in order: 52,54,57,61,63,63,68,70,75,79,82,86. Median = (63+68)/2 = 65.5 ≈ 65

Question 5

A rectangular block of wood measures 8 cm × 5 cm × 3 cm. What is its total surface area?

Accepted Answer

158 cm²

Answer

SA = 2(8×5 + 8×3 + 5×3) = 2(40+24+15) = 2×79 = 158 cm²

NAPLAN Practice Test

NAPLAN Practice Test

NAPLAN NAPLAN Numeracy Year 9 Practice 2