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**Rounding Decimal Numbers**

Sometimes close enough is good enough!

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**Molly has $16 in her pocket**

She buys: 3 $1.89 each 3 $2.19 each 3 Large French $ $1.79 each Does she have enough money?

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**About how much will it cost to fill up?**

Gas costs $1.79 per gallon I’m running on empty and I have a 20 gallon tank on my truck…… About how much will it cost to fill up?

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**You have one hour to take a 50 question test.**

About how much time can you spend on each question? Close enough is good enough!

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**The rounding poem Find your number Look right next door**

4 or less, just ignore 5 or more add one more!

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**Rounding Whole Numbers**

Round 474 to the closest hundred. 474 Find your number Look right next door Four or less, just ignore Five or more, add one more

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**474 Rounded to the hundreds becomes 500**

Round 474 to the closest 10’s 474 Just ignore - 470

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Try These 4,215 394 27 127,591 638

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**What about decimal numbers**

The same rules (and poem) apply! Round to the closest hundredths 4.167 Find your number Look right next door 4.17

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Remember If you are asked to round to the nearest tenth…….your answer stops at the tenth place! Example: Round to the closest tenth would be 42.7

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**Special Case! Rounding a 9**

Round to the closes hundredths Since there is a “9” in the hundredths place consider the tenth and hundredths together – 19 – do you leave it at 19 or move it to 20?

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**Round 4.95 to the closest tenth**

Since there is a “9” in the tenth spot consider the ones and tenths together…… should you leave it at 49 or move it to 50? 4.95 rounded to the nearest tenth is 5.0

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**Try these 4.56 4.6 5.32 5.3 0.98 1.0 Round to hundredths**

Round to tenths: 4.56 4.6 18.784 18.78 5.32 5.3 9.46 9.456 10.00 0.98 1.0 9.997

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Homework Page 600 Lesson 3-3 at the top of the page 1-20

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How do you ESTIMATE numbers? Use the skill of ROUNDING.

How do you ESTIMATE numbers? Use the skill of ROUNDING.

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