Doubling: Challenge & Extension
Mathematics
Grade 8
20 questions
~40 mins
1 views0 downloads
About This Worksheet
A worksheet exploring the concept of doubling through various questions, including practice, problem solving, real-world applications, and extension tasks.
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Doubling: Challenge & Extension
Subject: MathematicsGrade: Grade 8
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Untitled Worksheet
Grade Grade 8
A
Practice Questions
Answer all questions. Show your working in the grid spaces provided.
1.
What is double of 27?
[2 marks]2.
Calculate twice the value of 3.75.
[2 marks]3.
Find the double of 124.
[2 marks]4.
Construct a triangle with sides of 6 cm, 8 cm, and 10 cm. Then, draw its doubled version, where each side length is doubled.
[3 marks]5.
Plot the graph of y=2x on the grid.
[2 marks]B
Problem Solving & Reasoning
Solve the following multi-step problems. Show all your working.
1.
A recipe calls for 2 cups of sugar. If you want to double the recipe, how many cups of sugar will you need? If instead, you triple the recipe, how many cups are required?
[3 marks]2.
A student scores 18 out of 20 on a test. If the student’s score doubles, what is the new score? Is this a realistic increase? Why or why not?
[3 marks]3.
A garden plot measures 5 meters by 8 meters. If the owner doubles the size of the garden, what are the new dimensions? Calculate the area before and after doubling.
[4 marks]4.
A car’s speed is 60 km/h. If the speed doubles, how long will it take to travel 120 km? Explain your reasoning.
[3 marks]C
Real-world Applications
Answer the following questions based on real-world contexts.
1.
A painter needs 4 liters of paint to coat a wall. If they double the amount of paint, how much paint will they need? How many liters are needed if they triple the amount?
[3 marks]2.
A container holds 3 liters of water. If the water volume doubles, what is the new volume? What would be the volume if it is tripled?
[3 marks]D
Challenge & Extension
Attempt the following challenging questions to deepen your understanding.
1.
A recipe uses 1.5 cups of flour. If you want to make four times the original recipe, how many cups of flour are needed? Confirm your answer by calculation.
[4 marks]2.
A map scale shows 1 cm representing 50 km. If a route on the map is doubled in length, what is the actual distance? Provide your reasoning.
[4 marks]3.
An artist doubles the size of a painting. The original painting measures 30 cm by 40 cm. What are the dimensions of the enlarged painting, and what is the new area?
[4 marks]E
Mixed Review
Answer the variety of questions below to review your understanding of doubling.
1.
Calculate double of 0.75.
[2 marks]2.
If a school has 120 students, and the number doubles, how many students are there now?
[2 marks]3.
A recipe uses 3/4 cup of sugar. What is double that amount?
[2 marks]4.
A rectangle has length 9 cm and width 4 cm. If each dimension is doubled, what is the new area?
[3 marks]F
Error Analysis
Review the common mistake below and answer the questions.
1.
A student calculates double of 45 as 90. Is this correct? If not, identify the mistake and correct it.
[3 marks]2.
A student attempts to double 12.5 but writes 25.5. What mistake might they have made? Correct their calculation.
[3 marks]Quick Actions
What is Remix?
Create a new worksheet based on this one. Change the grade level, topic, number of questions, or difficulty - then generate a fresh version.
- • Change grade level (Grade 6 → Grade 7)
- • Swap topics (Harry Potter → Macbeth)
- • Add more questions (10 → 15)
- • Adjust difficulty
Details
- Created
- 1/1/2026
- Updated
- 1/1/2026
- Type
- worksheet