1. Round off the following numbers to the nearest...
| a | 8.4 | to the nearest whole number |
| b | 359 | to the nearest hundred |
| c | 2499 | to the nearest thousand |
| d | 4.39 | to the nearest tenth |
| e | 3.259 | to the nearest hundredth |
| f | 0.3044 | to the nearest thousandth |
| 2. Round the following to the degree of accuracy stated: | ||
| (a) 16 744 people at a soccer match | (to the nearest hundred people) | |
| (b) A capacity of 3249 litres | (to the nearest ten litres) | |
| (c) A salary of $55,555 | (to the nearest thousand dollars) | |
| (d) A measurement of 9.959 metres | (to the nearest centimetre) | |
3. (a) In the table below, round each number to 1 digit ( e.g. 17 becomes 20) and then calculate.
(b) Calculate the answer accurately and round it to 4 significant figures.
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Calculation |
(a) Estimate |
(b) Accurate answer |
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9.1 + 5.7 |
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|
28 x 1.9 |
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|
(8.4)2 |
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16.98 − (4.75 + 8.1) |
4.Round off the following numbers to the number of decimal places (d.p.) shown:
(a) 5.19 (to 1 d.p.)
(b) 6.498 (to 2 d.p.)
(c) 3.093 (to 2 d.p.)
(d) 0.2949 (to 3 d.p.)
(e) 927.295 (to 1 d.p.)
(f) 50.94 (to 0 d.p.)
5. Complete the table, by estimating the cost of each individual item to the nearest dollar and then calculating accurately.
|
Purchase |
Estimated cost |
Accurate cost |
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4 loaves of bread at $2.95 each |
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2 pies at $1.45c each |
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7 biscuits at $0.85 cents each |
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5 cans of drink at $1.75 each |
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4 packets of chips at $1.45 each |
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Totals |
