Rounding to the nearest tenth
Rounding to the nearest tenth
Purpose:
The purpose of this activity is to help your child to learn to round to the nearest tenth.
Link to the Number Framework:
Place value, Stage 7
What you need:
Supermarket receipt
Pen and paper
Calculator
What to do:
Give your child a supermarket shopping receipt and look at the prices together.
Ask them to round the prices to the nearest ten cent.
Remember that it is a mathematical convention to round 5 up to 10 although some supermarkets round 5 down to the nearest ten. (For example, Pak'n Save, New World and Four Square)
Write down the prices rounded to the nearest ten cents.
Ask your child to add up the rounded prices using a calculator. See how close it is to the actual cost.
What to expect your child to do:
• To round numbers to the nearest tenth.
Variations:
Round other decimals to the nearest tenth. For example, measure lengths (in metres and centimeters) and round to the nearest 10 centimeters.
He Kupu Māori:
|dollar |tāra |
|cent |hēneti |
|round (a number) |whakaawhiwhi (-a) |
|rounded price |utu whakaawhiwhi |
|receipt |rīhiti |
|supermarket |hokomaha |
He Whakawhitinga Kōrero:
• Anei te rīhiti mai i te hokomaha. Me tirotiro e tāua. (Here’s the receipt from the supermarket. Let’s have a look at it.)
• Whakaawhiwhia ngā utu ki te tekau hēneti e pātata ana. (Round the prices to the closest 10 cents.)
• Tuhia ngā utu whakaawhiwhi. (Write down the rounded prices.)
• Tāpirihia ngā utu whakaawhiwhi. (Add up the rounded prices.)
• Pēhea nei te pātata o te tapeke whakaawhiwhi ki te tapeke i utua. (How close is the rounded total to the total that was paid?)
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