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Finding 10% Mentally
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Finding 10% Mentally
Use mental strategies to find 10%. Show a calculation or explain your thinking where asked.
Understanding 10%
1.Complete the statements: 10% = out of 100 = out of 10 = 1/ .
2.Which mental operation finds 10% of a number?
- Multiply the number by 10
- Divide the number by 10
- Add 10 to the number
- Subtract 10 from the number
Mental Calculations
3.Work out 10% of 80. Show how you worked it out.
4.Work out 10% of 260. Show how you worked it out.
5.Work out 10% of 730. Show how you worked it out.
6.Work out 10% of 4,200. Show how you worked it out.
7.Find 10% of each number: 70; 240; 560; 1,800; and 5,300. Write the answers in order.
10% in Everyday Situations
8.A backpack costs $90. A shop takes 10% off the price. How many dollars are taken off?
9.A jug contains 640 mL of juice. Lachlan pours out 10% of the juice. How many millilitres does she pour?
10.There are 350 seats in a theatre. If 10% of the seats are reserved, how many seats are reserved?
11.A cycling group plans a 460 km trip. On Saturday, they travel 10% of the planned distance. How far do they travel on Saturday?
Strategies and Challenges
12.Select every correct way to find 10% of a number.
- Divide the number by 10
- Find one tenth of the number
- Move the decimal point one place to the left
- Multiply the number by 10
- Use a calculator every time
13.Match each amount to its 10% value.
- 300
- 920
- 1,500
- 5,100
- 150
- 510
- 92
- 30
14.Ten per cent of a number is 48. What is the whole number?
15.If 10% of 360 is 36, what is 20% of 360? Explain how you know.
3 printable pages
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