Free Year 9 Scientific notation Practice | Skillo
Skillo provides free Year 9 NAPLAN Scientific notation practice (AC9M9M02) for Australian students. No signup, no email, no credit card. Practice questions aligned with the ACARA Australian Curriculum v9.0 strand. Open and start in 10 seconds.
Year 9 students sitting their final NAPLAN need to be confident with scientific notation. Solve problems involving very small and very large measurements expressed in scientific notation. Skillo has targeted practice questions for this exact skill, mapped to the Australian Curriculum v9.0, free and ready to go.
No account needed. No email. No credit card.
What does the Year 9 NAPLAN Scientific notation test cover?
- Solve problems involving very small and very large measurements expressed in scientific notation.
- Questions may include word problems set in real Australian contexts
- Both calculator and non-calculator question types are covered
Try a sample Scientific notation question
Question 1 — Easy
Anika is a wildlife ranger tracking a koala in a eucalyptus tree. She stands 12 m from the base of the tree on flat ground and measures the angle of elevation to the koala as 53°. Her eyes are 1.6 m above the ground. What is the height of the koala above the ground, correct to the nearest tenth of a metre?
Answer: Using tan(53°) = opposite ÷ adjacent, the vertical distance from Anika's eyes to the koala = 12 × tan(53°) ≈ 12 × 1.3270 ≈ 15.9 m. Adding Anika's eye height of 1.6 m gives total height above ground = 15.9 + 1.6 = 17.5 m. Option A (15.9 m) is the height above Anika's eye level only, omitting the 1.6 m eye height — a common multi-step error. Option C (7.2 m) results from using 12 × tan(31°) ≈ 7.2, applying the complement angle. Option D (20.0 m) results from using 12 ÷ sin(37°) or a similar hypotenuse-based miscalculation.
Question 2 — Medium
A cable anchors a communication tower to the ground. The cable is 18 m long and is attached to the top of the tower. The cable makes an angle of 34° with the vertical tower. Which calculation gives the horizontal distance from the base of the tower to the anchor point, correct to the nearest metre?
Answer: The cable is the hypotenuse (18 m) and the angle is measured from the vertical tower. The horizontal distance is opposite to the 34° angle, so the ratio required is sin(34°) = opposite ÷ hypotenuse, giving 18 × sin(34°) ≈ 10 m. Option B uses cosine, which gives the side adjacent to the angle (the tower height, not the horizontal distance). Option C uses tangent, which applies only when the hypotenuse is not involved. Option D incorrectly divides rather than multiplies, treating the horizontal distance as the hypotenuse.
Question 3 — Hard
Luca is orienteering in the Dandenong Ranges. He walks in a straight line up a slope of 28° to the horizontal for a distance of 320 m along the slope. How much higher above his starting point is Luca when he reaches the end of the slope? Give your answer to the nearest metre.
Answer: The slope distance (320 m) is the hypotenuse and the vertical height gained is opposite to the 28° angle. Applying sin(28°) = opposite ÷ hypotenuse gives height = 320 × sin(28°) ≈ 320 × 0.4695 ≈ 150 m. Option B results from using 320 × cos(28°) ≈ 282 m, which gives the horizontal distance rather than the vertical height. Option C results from using 320 × tan(28°) ≈ 170 m, incorrectly applying tangent when the hypotenuse is known. Option D results from computing 320 ÷ cos(28°) ≈ 362 m or a similar error treating height as the hypotenuse.
How should my child prepare for Year 9 NAPLAN Scientific notation?
- Select Year 9 and Numeracy on the home screen
- Use Quick Practice — questions on scientific notation will appear as part of the session
- Check the Skill Breakdown on your profile to track your accuracy on scientific notation specifically
- Review explanations after each question to understand the reasoning behind correct answers
Skillo is free, requires no email or account details, and is built specifically for Australian students. Every question is mapped to the Australian Curriculum v9.0 and filtered by skill so your child practises exactly what they need.
Common questions about NAPLAN Scientific notation
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Does my child need an account?
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Does Skillo collect any personal information?
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Is Skillo affiliated with NAPLAN?
Skillo's NAPLAN-style practice is authored independently. NAPLAN® is a registered trademark of ACARA. Skillo is not affiliated with, endorsed by, or sponsored by ACARA.
No account needed. No email. No credit card.
About this practice
Skillo's NAPLAN-style practice is authored independently. NAPLAN® is a registered trademark of ACARA. Skillo is not affiliated with, endorsed by, or sponsored by ACARA.