This task is about rounding and multiplying prices.
Jackie was shopping at a garden centre. She estimated the cost of her purchases by:
- rounding the cost of a single plant to the nearest ten dollars, and
- multiplying it by the number of plants she wanted.
Write down Jackie's estimate for each group of items.
| a) |
25 roses costing $12.50 each. $__________ |
| b) |
12 trees costing $23.95 each. $__________ |
| c) |
Five sets of terracotta pots costing $74.75 per set. $__________ |
| d) |
Why is Jackie's method of estimating the total bill not very accurate?
|
| e) |
How could she get a more accurate estimate while still using numbers that are easy to multiply in her head?
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