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Addition Algorithms Everyday Contexts

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Addition Algorithms Everyday Contexts

Use the vertical-column method where asked. Keep decimal points lined up and show your working. Amounts are in New Zealand dollars.

Shopping totals

1.A stationery shop charges $6.78 for a workbook, $3.56 for a set of highlighters and $2.89 for a folder. Use vertical addition to find the total cost.

2.At a weekend market, Tane buys a jar of honey for $8.65, a loaf of bread for $5.90, cheese for $7.48 and pears for $4.76. Calculate the total using vertical addition.

3.When setting out decimal amounts for addition, which action helps keep the place values correct?

Place all the decimal points directly beneath one another.
Put the longest amount on the left and start there.
Remove the decimal points before adding.
Round every amount to the nearest dollar first.

4.Charlotte buys a water bottle for $14.60, a lunch container for $9.35 and a rain jacket for $16.20. Which is the best estimate of the total?

About $30
About $35
About $40
About $50

Addition methods and checking

5.Describe how to add $37.86 and $29.57 with the vertical-column method. Explain how you use place value and regrouping.

6.In a money addition calculation, what does regrouping mean? Give an example using cents.

7.Ari calculates $48.79 + $26.38 as $75.17. Use rounding to estimate the total, then decide whether his answer is reasonable.

Money in everyday situations

8.A family visits a local food stall. They spend $12.85 on dumplings, $8.70 on fruit and $6.95 on juice. Find their total bill using vertical addition. Show how the cents regroup.

9.Give one reason why careful addition matters when you are working out the total cost of purchases.