rounding decimal numbers
DESCRIPTION
Rounding Decimal Numbers. Grade 6 Unit NSN. Re-cap…. What is a place value chart? What are the periods in the place value chart? What are the greater than and less than symbols?. What does it mean to round a number? What does it mean to estimate?. Molly has $16 in her pocket. She buys: - PowerPoint PPT PresentationTRANSCRIPT
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Rounding Decimal Numbers
Grade 6 Unit NSN
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Re-cap… What is a place value chart? What are the periods in the place value
chart? What are the greater than and less than
symbols?
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What does it mean to round a number?
What does it mean to estimate?
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Molly has $16 in her pocket
She buys:
•3 hotdogs @ $1.89 each
•3 milkshakes @ $2.19 each
•3 Large French fries @ $ $1.79 each
Does she have enough money?
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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?
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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 numberLook 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 4.167 to the closest hundredths
4.167 Find your number
Look right next door
4.17
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RememberIf you are asked to round to the nearest tenth…….your
answer stops at the tenth place!
Example: Round 42.73 to the closest tenth would be 42.7
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Special Case!Rounding a 9
Round 2.197 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:
4.56 4.6
5.32 5.3
0.98 1.0
Round to hundredths
18.784 18.78
9.456 9.46
9.997 10.00