Rounding and Estimation Workbook

7/28/2019 Rounding and Estimation Workbook

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Roundingand Estimation

5 or more, raise the score!

4 or less, let it rest!


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Table of Contents

Rounding and Estimation

Wild Round-Up #1

Round 'Em Up!

Wild Round-Up #2

Measuring on the Farm

Measuring Food

Measuring Nature

Measuring on the Road

Measuring Sports

Rounding and Subtracting #1

Rounding and Subtracting #2Rounding and Subtracting #3

Estimate the Sum

Sweet Estimation

Magical Math

Front-End Estimation

Round and Add #1

Round and Add #2

Round and Add #3

Certificate of Completion


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Round the numbers to the nearest 10!If the ones number is 5 or greater, round up to the nearest 10.

If the ones number is 4 or less, round down to the nearest 10.

18 20 13 10

24 47 32

11 9 56


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Round Em Up!Round the numbers to the nearest ten.

Rounding to the nearest ten

If the ones number is 5 or greater,round up to the nearest ten.If the ones number is4 or less,round down to the nearest ten.

Rounding to the nearest hundred

If the tens number is 5 or greater,round up to the nearest hundred.If the tens number is4 or less,round down to the nearest hundred.

56

12

48

79

31

27

61

84

18

35

73

24

43

67

86

52

486

824

266

148

521

378

651

234

17Example: 20Example: 12 10

161Example: 200Example:118 100


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Round the numbers to the nearest 100.If the tens number is 5 or greater, round up to the nearest 100.

If the tens number is 4 or less, round down to the nearest 100.

185 200 136 100

315 475 136

722 97 556


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Measuring on the farm!First guess how long you think the measurements are.

Then use your ruler to measure to the nearest whole number.

A: How long do you think the pig is? Inches: Centimeters:

Using your ruler, how long is the pig? Inches: Centimeters:

B: How tall do you think the pig is? Inches: Centimeters:

Using your ruler, how tall is the pig? Inches: Centimeters:

C: How long do you think the pigs tail is? Inches: Centimeters:

Using your ruler, how long is the pigs tail? Inches: Centimeters:

B

A

C


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Measuring food!First guess how long you think the measurements are.


A: How tall do you think the apple is?

Inches: Centimeters:

Using your ruler, how tall is the apple?


B: How long do you think the apple

stem is?


Using your ruler, how long is theapple stem?


C: How long do you think the apple seed is? Inches: Centimeters:

Using your ruler, how long is the apple seed? Inches: Centimeters:

A

C

B


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Measuring nature!First guess how long you think the measurements are.


A: How tall do you think the flower is?


Using your ruler, how tall is the flower?


B: How wide do you think the flower is?


Using your ruler, how wide is the flower?


C: How long do you think the flowers leaf is?


Using your ruler, how long is the flowers leaf?


A

C

B


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A

B

C

Measuring on the Road!First guess how long you think the measurements are.


A: How long do you think the truck is? Inches: Centimeters:

Using your ruler, how long is the truck? Inches: Centimeters:

B: How tall do you think the truck is? Inches: Centimeters:

Using your ruler, how tall is the truck? Inches: Centimeters:

C: How tall do you think the trucks tire is? Inches: Centimeters:


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Measuring sports!First guess how long you think the measurements are.


A: How long do you think the football is?


Using your ruler, how long is the football?

Inches:

Centimeters:

B: How wide do you think the football is?


Using your ruler, how wide is the football?


C: How long do you think the football laces are?


Using your ruler, how long are the football laces?


A

B

C


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Estimating numbers makes you speedy! Round the numbers before

subtracting. Remember, when rounding to the nearest ten:

Rounding and Subtracting

89 11 = 90 10 80=

Example

2Grade

77 51 = =

54 20 = =

19

12 = =

If the number in the ones place is 5 or greater, round up to the nearest ten.

If the number in the ones place is 4 or less, round down to the nearest ten.

Example: 18 20

14 10


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91 62 = 90 60 30=

Example

2Grade

65 24 = =

87 66 = =

70

52 = =



Example: 18 20

14 10


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78 15 = 80 20 60=

Example

2Grade

56 50 = =

88 14 = =

96

90 = =



Example: 18 20

14 10


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Estimate the sums by rounding the numbers to the nearest hundred first

and then adding them together. Dont forget to show your work!

".

"

".

"9;7.578

"79:

"654.84;

"543

.6:;

"

.

"";83

"

.

"45;

.746

Hvwlpdwh"wkh"Vxp200

400

600


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Sweet EstimationEstimate the sum by rounding each number to the nearesthundred. Show your work!

189

334+ +

441

323+ +

252

368+ +

363

429+ +

598

176+ +

625

238+ +

324

150+ +

716

202+ +

137

381+ +


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Magical MathEstimate the difference by rounding each number to thenearest hundred. Show your work!

608

372

797

273

834

375

481

115

321

148

654

283

225

88

507

284

253

72


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Front-End EstimationFront-end estimation only uses the numbers in the very left column.

If you are working with a 2 digit number, you will round to the nearest tens place, and

if you are working with a 3 digit number, you will round to the nearest hundreds place.

42+17

40+2060

263-119

300-100200

75

+12

+

96

+35

+

42

+56

+

87

+23

+

63

-37

-

58

-21

-

93

-85

-

27

-16

-

Examples:


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Round and Add!Round the numbers to the nearest tens and

then add them together!

+ =

21 45

+ =

37 52

91 13

#1


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Round and Add!Round the numbers to the nearest tens and


+ =

86 34

+ =

59 18

61 26

#2


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Round and Add!Round the numbers to the nearest hundreds and


+ =

165 314

+ =

589 218

824 487

#3


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is an Education.com math superstar

Great job!

Documents

Rounding and Estimation Workbook