Aussie Maths & Science Teachers: Save your time with SmarterEd
Shannon is buying materials to make a bookcase.
She rounds each price in the table below to the nearest dollar to estimate the total cost of the materials.
| Materials | |
| Item | Cost |
| hammer | $5.65 |
| glue | $3.95 |
| wood | $11.55 |
| nails | $1.60 |
| stain | $3.85 |
How much is Shannon's estimate? (2 marks)
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Use a calculator to find `29.50072 div 8`.
Write your answer and then round to 1 decimal place. (2 marks)
Min was competing in the long jump at the athletics carnival.
The lengths of her jumps are listed in the table below.
| Long Jump Distances | ||
| 4.325 m | 4.589 m | 4.283 m |
What was her longest jump, rounded to 2 decimal places. (2 marks)
Round 139.98 to 1 decimal place. (1 mark)
Round 45.796 to 2 decimal places. (1 mark)
Round 123.4567 to 2 decimal places. (1 mark)
Would 3.4 be approximately equal to 3 or 4 when rounded to the nearest whole number? (1 mark)
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Method 1.
`text(Test 3:)\ 3.4-3 = 0.4`
`text(Test 4:)\ 4-3.4 = 0.6`
`:.\ 3.4 ~~ 3\ text{(nearest whole number) as it is closer}`
Method 2.
`text(Using a number line)`
`:.\ 3.4 ~~ 3\ text{(nearest whole number) as it is closer}`
Would 2.47 be approximately to 2.4 or 2.5 when rounded to 1 decimal place? (1 mark)
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Method 1.
`text(Test 2.4:)\ 2.47-2.4 = 0.07`
`text(Test 2.5:)\ 2.5-2.47 = 0.03`
`:.\ 2.47 ~~ 2.5\ text{(1 d.p.) as it is closer}`
Method 2.
`text(Using a number line)`
`:.\ 2.47 ~~ 2.5\ text{(1 d.p.) as it is closer}`
It takes a ray of sunlight 479.746 seconds to reach the earth from the sun.
How long is this, rounded to two decimal places? (1 mark)
The average cost of manufacturing a car tyre is calculated in dollars, and shown below.
What is the average cost rounded to the nearest 5 cents? (1 mark)
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