7. Write the following numbers correct to the nearest ten - Junior Cycle Mathematics - Question 7 - 2012
Question 7
7. Write the following numbers correct to the nearest ten.
121
195
504
(b) Write the following numbers correct to 3 decimal places.
105-5555
2-173
0.0264
(c) Wri... show full transcript
Worked Solution & Example Answer:7. Write the following numbers correct to the nearest ten - Junior Cycle Mathematics - Question 7 - 2012
Step 1
Write the following numbers correct to the nearest ten.
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Answer
The numbers rounded to the nearest ten are:
121 becomes 120
195 becomes 200
504 becomes 500
Step 2
Write the following numbers correct to 3 decimal places.
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Answer
The numbers rounded to three decimal places are:
105-5555 becomes 105.556
2-173 becomes 2.173
0.0264 becomes 0.026
Step 3
Write the following numbers correct to two significant figures.
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Answer
The numbers rounded to two significant figures are:
2920 becomes 2900
159 becomes 160
0.0336 becomes 0.034
Step 4
Work out her estimate.
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Answer
To find the estimate, round each price to the nearest euro:
€1.95 rounds to €2
€1.99 rounds to €2
€3.59 rounds to €4
€1.40 rounds to €2
€0.99 rounds to €1
Therefore, the estimate is:
extTotalEstimate=2+2+4+2+1=€11
Step 5
Based on the estimate, would she think she had enough money?
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No, based on the estimate of €11, she would not think she had enough money since she had only €10.
Step 6
Work out the exact cost of the magazines.
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The exact cost of the magazines can be calculated as follows:
extTotalCost=€1.95+€1.99+€3.59+€1.40+€0.99=€9.92
Step 7
Suggest what you think is a better method for estimating the total cost of the magazines.
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Answer
Method: Round to the nearest whole number.
Reason: This should give a more accurate estimate because some will round up and some will round down, providing a better overall approximation.
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