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Finding 10% Mentally

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Finding 10% Mentally worksheet preview
Finding 10% Mentally

Finding 10% Mentally

Percentage calculation illustration

🧠 Part 1: Understanding 10%

1. Complete the equation by filling in the blanks:

10% = _______ out of 100 = _______ out of 10 = 1/____

2. Circle the correct mental strategy for finding 10% of any number:

Multiply the number by 10

Divide the number by 10

Add 10 to the number

Subtract 10 from the number

🔢 Part 2: Mental Calculations

3. Calculate 10% of these numbers mentally. Show your thinking:

a) 10% of 60 = _______

b) 10% of 150 = _______

c) 10% of 340 = _______

d) 10% of 2,500 = _______

4. Quick Challenge! Find 10% of these numbers:

90 → _____ | 180 → _____ | 450 → _____ | 1,200 → _____ | 3,600 → _____

💰 Part 3: Real-Life Problems

5. A new video game costs $80. The shop is offering 10% off. How much money will you save?

Answer: You will save $ _______

6. Sarah's water bottle holds 750 mL. She drank 10% of it during lunch. How much water did she drink?

Answer: Sarah drank _______ mL

7. A school has 420 students. 10% of them play in the school band. How many students play in the band?

Answer: _______ students play in the band

8. Tom's family drove 280 kilometres on their holiday. They completed 10% of their journey on the first day. How far did they drive on the first day?

Answer: They drove _______ kilometres on the first day

🎯 Part 4: Problem Solving Strategies

9. Check all the strategies that help you find 10% mentally:

Move the decimal point one place to the left

Divide the number by 10

Think of it as 1/10 of the number

Use a calculator every time

Check your answer by multiplying by 10

10. Match each number with its 10% value:
1. 200
2. 850
3. 1,600
4. 4,700
A. 160
B. 85
C. 470
D. 20

🌟 Part 5: Extension Challenge

11. If you know that 10% of a number is 35, what is the original number?

The original number is: _______

12. Explain in your own words how finding 10% mentally helps you in everyday life:
13. Challenge: If 10% of 240 is 24, can you work out what 20% of 240 would be? Explain your thinking:

20% of 240 = _______

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