NAPLAN NAPLAN Numeracy Year 9 Practice 3

Question 1

A bicycle costs $650. An instalment plan requires a $130 deposit plus 12 monthly payments of $45. How much extra does the instalment plan cost compared to paying in full?

Accepted Answer

$20

Answer

Total instalment = $130 + 12×$45 = $670. Extra = $670 − $650 = $20

Question 2

Which whole number is closest to √200?

Accepted Answer

14

Answer

14² = 196 and 15² = 225. √200 ≈ 14.1, so closest is 14

Question 3

Monthly rainfall (mm) for Sydney over 6 months: Jan 90, Feb 110, Mar 130, Apr 120, May 100, Jun 130. What is the mean monthly rainfall?

Accepted Answer

113 mm

Answer

Mean = (90+110+130+120+100+130) ÷ 6 = 680 ÷ 6 ≈ 113 mm

Question 4

A triangular garden has a base of 12 m and a perpendicular height of 8 m. What is the area of the garden?

Accepted Answer

48 m²

Answer

Area = ½ × base × height = ½ × 12 × 8 = 48 m²

Question 5

A water tank holds 3 000 litres when full. The tank is currently 35% full. How many more litres are needed to fill it?

Accepted Answer

1 950 L

Answer

Current = 35% × 3000 = 1050 L. Needed = 3000 − 1050 = 1950 L

NAPLAN Practice Test

NAPLAN Practice Test

NAPLAN NAPLAN Numeracy Year 9 Practice 3