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Published byMarissa Reyes Modified over 2 years ago

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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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Gas costs $1.79 per gallon Im 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 10s 474 Just ignore - 470

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Try These 4, ,

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What about decimal numbers The same rules (and poem) apply! Round to the closest hundredths 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 Round to tenths: Round to hundredths

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

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