Upload
hope-kennedy
View
228
Download
4
Embed Size (px)
Citation preview
33rdrd Grade Grade
RoundingRounding
By Monica YuskaitisBy Monica Yuskaitis
Copyright © 2000 by Monica Yuskaitis
California Standard California Standard AddressedAddressed
1.4 Round off numbers to 10,0001.4 Round off numbers to 10,000to the nearest ten, hundred, andto the nearest ten, hundred, and
thousand.thousand.
NumberNumber
SenseSenseThirdThird
GradeGrade
Copyright © 2000 by Monica Yuskaitis
ObjectivesObjectives
To be able to round numbers to To be able to round numbers to the nearest tenthe nearest ten
To be able to round numbers to To be able to round numbers to the nearest hundredthe nearest hundred
To be able to round numbers to To be able to round numbers to the nearest thousandthe nearest thousand
Copyright © 2000 by Monica Yuskaitis
VocabularyVocabulary Round – to replace an exact Round – to replace an exact
number by another that is close number by another that is close to it in value and easier to use. to it in value and easier to use. For example, 52, rounded to the For example, 52, rounded to the nearest ten is 50.nearest ten is 50.
Copyright © 2000 by Monica Yuskaitis
Use roundingUse rounding• When the question asks you
to estimate.• When the question asks
“about how many”…?• When an exact answer isn’t
possible.• When an answer is difficult to obtain.
Copyright © 2000 by Monica Yuskaitis
Memorize this PoemMemorize this Poem
Find your number.Look right next door.4 or less just ignore.5 or more, add 1 more.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
ten.ten.
Find your number.
4 7Circle the number in the tens
place.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
ten.ten.
Look right next door.
4 7Draw an arrow to the right of the
number.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
ten.ten.
4 or less, just ignore.
4 77 is larger than 4 so go to the
next line of the poem.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
ten.ten.
5 or more, add 1 more.
4 7Add 1 to the 4.
+1
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
ten.ten.
5 or more, add 1 more.
5 0After adding 1 to the 4, all the numbers
to the right of the 5 become 0’s.
Copyright © 2000 by Monica Yuskaitis
The AnswerThe Answer
4 7 rounded to the nearest tens place is
5 040 5047
Note 47 is closer to 50 on the number line.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
hundred.hundred.
Find your number.
9 8 6Circle the number in the hundreds
place.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
hundred.hundred.
Look right next door.
9 8 6Draw an arrow to the right of the
number.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
hundred.hundred.
4 or less, just ignore.
9 8 68 is larger than 4 so go to the
next line of the poem.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
hundred.hundred.
5 or more, add 1 more.
9 8 6Add 1 to the 9.
+1
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
hundred.hundred.
5 or more, add 1 more.
1, 0 0 0After adding 1 to the 9, all the numbers
to the right of the 10 become 0’s.
Copyright © 2000 by Monica Yuskaitis
The AnswerThe Answer
986 rounded to the nearest hundreds
place is1, 0 0 01,000900 986
Note 986 is closer to 1,000 on the number line.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
thousand.thousand.
Find your number.
3 5, 3 2 7Circle the number in the thousands
place.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
thousand.thousand.
Look right next door.
3 5, 3 2 7Draw an arrow to the right of the
number.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
thousand.thousand.
4 or less, just ignore.
3 5, 3 2 7
Since 3 is less than 4 we do not changethe 5.
Copyright © 2000 by Monica Yuskaitis
Round this number to the Round this number to the nearestnearest
thousand.thousand.
4 or less, just ignore.
3 5, 0 0 0
Change the numbers to left of 5 to 0’s.
Copyright © 2000 by Monica Yuskaitis
The AnswerThe Answer
35,327 rounded to the nearest thousand is3 5, 0 0 0
35,000 36,00035,327
Note 35,327 is closer to 35,000 on the number line than to 36,000.
Copyright © 2000 by Monica Yuskaitis
Round these numbers to Round these numbers to the nearest ten.the nearest ten.
1 3 9
4 5
2 8 2
9 7
1 4 0
5 0
2 8 0
1 0 0
Copyright © 2000 by Monica Yuskaitis
Round these numbers to Round these numbers to the nearest hundred.the nearest hundred.
2, 1 3 9
1 9, 7 4 5
2 8 2
3, 1 9 7
2, 1 0 0
1 9, 7 0 0
3 0 0
3, 2 0 0
Copyright © 2000 by Monica Yuskaitis
Round these numbers to Round these numbers to the nearest thousand.the nearest thousand.
2, 8 3 9
1 9, 4 4 5
8, 9 8 2
4 3,1 9 7
3, 0 0 0
1 9, 0 0 0
9, 0 0 0
4 3, 0 0 0
Copyright © 2000 by Monica Yuskaitis
CreditsCredits Illustrations from:Illustrations from:
Clipart from ClickArt 125,000 Clipart from ClickArt 125,000 Deluxe Image Pak, T/Maker Co., Deluxe Image Pak, T/Maker Co., Broderbund Software, Inc.Broderbund Software, Inc.