10%, 50%, 25%: Error Analysis & Misconceptions
Mathematics
Grade 7
14 questions
~28 mins
1 views0 downloads
About This Worksheet
A worksheet focusing on common errors and misconceptions related to calculating 10%, 50%, and 25% of amounts, designed for Grade 7 students to develop procedural mastery and reasoning skills.
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10%, 50%, 25%: Error Analysis & Misconceptions
Subject: MathematicsGrade: Grade 7
Name:
Date:
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Untitled Worksheet
Grade Grade 7
A
Fluency & Practice
Answer all questions. Show your working in the grid spaces provided.
1.
Calculate 10% of 240 using a calculation approach.
[2 marks]2.
Find 50% of 80.
[2 marks]3.
What is 25% of 60?
[2 marks]4.
Calculate 10% of 150.
[2 marks]B
Problem Solving & Reasoning
Answer all questions. Show detailed reasoning in the grid areas.
1.
A jacket costs $80. What is the total discount if a store offers 25% off? Explain your calculation.
[3 marks]2.
A recipe uses 200g of sugar. If you mistakenly think 10% of sugar is used, how much sugar is that? Is this an accurate calculation? Explain why or why not.
[3 marks]3.
A student calculates 50% of 90 as 45. Is this correct? If not, what mistake might they have made?
[2 marks]4.
A discount of 25% is applied to a $120 item. If a student calculates the discount as 30%, what is the mistake? Correct the calculation.
[3 marks]C
Real-world Applications
Answer all questions, explaining your reasoning clearly.
1.
A school has 500 students. If 10% of the students are absent on a particular day, how many students are absent? Show your working.
[2 marks]2.
A farmer harvests 400kg of apples. If 25% of the apples are rotten and discarded, how many apples are good? Explain your reasoning.
[3 marks]D
Challenge & Extension
Attempt these more difficult problems to extend your understanding.
1.
A factory produces 1200 units monthly. If 50% of the units meet quality standards, how many units are defective? Show your calculations.
[3 marks]2.
Construct a rectangle on the grid such that its length is 25% longer than its width. Describe the dimensions.
[3 marks]Construction space
E
Mixed Review & Error Correction
Answer all questions, identifying errors where given.
1.
A salesperson earns $2000 per month. They think that 10% of their salary is $150. Is this correct? If not, what is the correct 10% of their salary?
[2 marks]2.
Calculate 50% of 300 and 25% of 80. Which is larger? Show your work.
[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