3 rd Grade Rounding By Monica Yuskaitis. Copyright © 2000 by Monica Yuskaitis California Standard...

transcript

33rdrd Grade Grade

RoundingRounding

By Monica YuskaitisBy 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

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

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.

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.

Memorize this PoemMemorize this Poem

Find your number.Look right next door.4 or less just ignore.5 or more, add 1 more.

Round this number to the Round this number to the nearestnearest

ten.ten.

Find your number.

4 7Circle the number in the tens

place.

ten.ten.

Look right next door.

4 7Draw an arrow to the right of the

number.

ten.ten.

4 or less, just ignore.

4 77 is larger than 4 so go to the

next line of the poem.

ten.ten.

5 or more, add 1 more.

4 7Add 1 to the 4.

ten.ten.

5 0After adding 1 to the 4, all the numbers

to the right of the 5 become 0’s.

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.

hundred.hundred.

Find your number.

9 8 6Circle the number in the hundreds

place.

hundred.hundred.

9 8 6Draw an arrow to the right of the

number.

hundred.hundred.

9 8 68 is larger than 4 so go to the

next line of the poem.

hundred.hundred.

9 8 6Add 1 to the 9.

hundred.hundred.

1, 0 0 0After adding 1 to the 9, all the numbers

to the right of the 10 become 0’s.

986 rounded to the nearest hundreds

place is1, 0 0 01,000900 986

Note 986 is closer to 1,000 on the number line.

thousand.thousand.

Find your number.

3 5, 3 2 7Circle the number in the thousands

place.

thousand.thousand.

3 5, 3 2 7Draw an arrow to the right of the

number.

thousand.thousand.

3 5, 3 2 7

Since 3 is less than 4 we do not changethe 5.

thousand.thousand.

3 5, 0 0 0

Change the numbers to left of 5 to 0’s.

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.

Round these numbers to Round these numbers to the nearest ten.the nearest ten.

Round these numbers to Round these numbers to the nearest hundred.the nearest hundred.

2, 1 3 9

1 9, 7 4 5

3, 1 9 7

2, 1 0 0

1 9, 7 0 0

3, 2 0 0

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

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.

3 rd Grade Rounding By Monica Yuskaitis. Copyright © 2000 by Monica Yuskaitis California Standard...

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