Rounding and Estimation Workbook

Rounding and Estimation

5 or more, raise the score! 4 or less, let it rest!

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 #2 Rounding 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

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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

Created by:

20

13

10

24

47

32

11

9

56

88

73

3

65

95

41

Copyright © 2012-2013 by Education.com

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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. Example: 17 If the ones number is 4 or less,round down to the nearest ten. Example: 12

56

31

18

43

12

27

35

67

48

61

73

86

79

84

24

52

20 10

Rounding to the nearest hundred If the tens number is 5 or greater,round up to the nearest hundred. Example:161 200 If the tens number is 4 or less,round down to the nearest hundred. Example:118 100

486

266

521

651

824

148

378

234

333

613

883

949

551

195

728

762

Here’s a little rhyme to help you remember how to round numbers: 5 or more, raise the score 4 or less, let it rest

Created by :

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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

818

361

228

685

165

998

Created by:



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

C B

A: How long do you think the pig is?

Inches:

Using your ruler, how long is the pig? B: How tall do you think the pig is?

Centimeters:

Inches:

Centimeters:

Inches:

Using your ruler, how tall is the pig?

Centimeters:

Inches:

C: How long do you think the pig’s tail is?

Centimeters:

Inches:

Using your ruler, how long is the pig’s tail?

Centimeters:

Inches:

Centimeters:

A: How tall do you think the duck is?

B

Inches:

Centimeters:

Using your ruler, how tall is the duck?

A

Inches:

Centimeters:

B: How long do you think the duck’s neck is? Inches:

Centimeters:

Using your ruler, how long is the duck’s neck? Inches:

Created by:


Centimeters:


Measuring food! First guess how long you think the measurements are. Then use your ruler to measure to the nearest whole number.

A: How tall do you think the apple is?

B

Inches:

Centimeters:

Using your ruler, how tall is the apple? Inches:

A

Centimeters:

B: How long do you think the apple stem is?

C

Inches:

Centimeters:

Using your ruler, how long is the apple stem? Inches: C: How long do you think the apple seed is? Inches:

Centimeters: Centimeters:

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

Centimeters:

A: How long do you think the peanut is? Inches:

Centimeters:

Using your ruler, how long is the peanut? Inches:

Centimeters:

B: How wide do you think the peanut is? Inches:

A

Centimeters:

Using your ruler, how wide is the peanut? Inches:

Centimeters:

B

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Measuring nature! First guess how long you think the measurements are. Then use your ruler to measure to the nearest whole number. A: How tall do you think the flower is?

B

Inches:

Centimeters:

Using your ruler, how tall is the flower? Inches:

Centimeters:

B: How wide do you think the flower is? Inches:

A

Centimeters:

Using your ruler, how wide is the flower? Inches:

Centimeters:

C: How long do you think the flower’s leaf is?

C

Inches:

Centimeters:

Using your ruler, how long is the flower’s leaf? Inches:

Centimeters:

A: How tall do you think the tree is? Inches:

Centimeters:

Using your ruler, how tall is the tree? Inches:

Centimeters:

B

A

B: How long do you think the tree branch is? Inches:

Centimeters:

Using your ruler, how long is the tree branch? Inches:

Created by:

Centimeters:



Measuring on the Road! First guess how long you think the measurements are. Then use your ruler to measure to the nearest whole number.

B C A A: How long do you think the truck is?

Inches:

Using your ruler, how long is the truck? B: How tall do you think the truck is?

Centimeters:

Inches:

Inches:

Using your ruler, how tall is the truck?

Centimeters:

Inches:

C: How tall do you think the truck’s tire is?

Centimeters:

Inches:

Using your ruler, how tall is the truck’s tire?

Centimeters:

Inches:

Centimeters: Centimeters:

A: How long do you think the motorcycle is? Inches:

Centimeters:

Using your ruler, how long is the

B

motorcycle? Inches:

Centimeters:

B: How tall do you think the motorcycle is? Inches:

Centimeters:

Using your ruler, how tall is the motorcycle? Created by:

A


Inches:

Centimeters:


Measuring sports! 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 football is? Inches:

Centimeters:

Using your ruler, how long is the football? Inches:

C

Centimeters:

B: How wide do you think the football is? Inches:

Centimeters:

Using your ruler, how wide is the football? Inches:

A

Centimeters:

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

Centimeters:

B

Using your ruler, how long are the football laces? Inches:

Centimeters:

B A A: How long do you think the baseball bat is? Inches:

Centimeters:

Using your ruler, how long is the baseball bat? Inches:

Centimeters:

B: How long do you think the baseball bat grip is? Inches:

Centimeters:

Using your ruler, how long is the baseball bat grip? Inches: Created by:

Centimeters:



Grade

2

Rounding and Subtracting Estimating numbers makes you speedy! Round the numbers before subtracting. Remember, when rounding to the nearest ten: 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

Example

89 − 11 =

90 − 10

=

77 − 51 =

=

54 − 20 =

=

19 − 12 =

=

74 − 57 =

=

96 − 65 =

=

49 − 34 =

=

52 − 27 =

=


80


Grade

2


Example

91 − 62 =

90 − 60

=

65 − 24 =

=

87 − 66 =

=

70 − 52 =

=

98 − 89 =

=

83 − 71 =

=

99 − 20 =

=

42 − 33 =

=


30


Grade

2


Example

78 − 15 =

80 − 20

=

56 − 50 =

=

88 − 14 =

=

96 − 90 =

=

37 − 15 =

=

78 − 13 =

=

99 − 37 =

=

57 − 24 =

=


60


Estimate the sums by rounding the numbers to the nearest hundred first and then adding them together. Don’t forget to show your work!

Hvwlpdwh"wkh"Vxp "543 .6:;

" 200 . 400 600

"45; .746

" .

"9;7 .578

" .

"654 .84;

" .

"79: .6:9

" .

";83 .438

" .

"<74 .556

" .

":87 .5;8

" .

Created by:



Sweet Estimation Estimate the sum by rounding each number to the nearest hundred. Show your work! 189 + 334

363 + 429

324 + 150

681 + 99

463 + 276

+

441 + 323

+

598 + 176

+

716 + 202

+

528 + 145

+

701 + 163

+

252 + 368

+

+

625 + 238

+

+

137 + 381

+

+

848 + 136

+

+

648 + 220

+

Created by :



Magical Math Estimate the difference by rounding each number to the nearest hundred. Show your work! 608 372

481 115

225 88

797 273

321 148

507 284

834 375

654 283

253 72

449 132

363 180

883 329

719 285

917 432

692 231

Created by :



Front-End Estimation Front-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.

Examples: 42 +17

75 +12

63 -37

563 +315

792 -134

Created by:

40 +20 60

+

96 +35

-

58 -21

+

231 +447

-

949 -381

263 -119

+

42 +56

-

93 -85

+

612 +289

-

417 -199


300 -100 200

+

87 +23

+

-

27 -16

-

+

876 +126

+

-

650 -511

-


Round and Add! Round the numbers to the nearest tens and then add them together!

45

21

+

= 52

37

+

= 13

91

+

= 72

68

+ Created by:

#1


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Round and Add! Round the numbers to the nearest tens and then add them together!

34

86

+

= 18

59

+

= 26

61

+

= 48

97

+ Created by:

#2



Round and Add! Round the numbers to the nearest hundreds and then add them together!

314

165

+

= 218

589

+

= 487

824

+

= 627

714

+ Created by:

#3



Great job! is an Education.com math superstar

Rounding and Estimation Workbook

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