Questions

zMath 130 - Unit 12: Place Value and Estimating

Place Value

This unit is starting with a review of place value. For questions 1 – 20, select the number that names the place value picture.

2 hundreds, 2 tens, and 3 ones is equal to _____.

A) 115

B) 223

C) 213

D) 231

1 hundred, 1 ten, and 3 ones is equal to _____.

A) 115

B) 114

C) 113

D) 231

How many ones would you need to equal 314?

A) 1

B) 2

C) 3

D) 4

How many tens would you need to equal 812?

A) 1

B) 2

C) 3

D) 4

How many hundreds would you need to equal 942?

A) 7

B) 8

C) 9

D) 10

6 tens and 7 ones is equal to ________.

A) 76

B) 222

C) 67

D) 607

9 tens and 5 ones is equal to _____.

A) 95

B) 59

C) 905

D) 950

8 tens and 5 ones is equal to _____.

A) 82

B) 83

C) 84

D) 85

6 tens and 6 ones is equal to _____.

A) 60

B) 66

C) 06

D) 106

10)

9 tens and 6 ones is equal to _____.

A) 94

B) 95

C) 96

D) 97

11)

5 hundreds, 4 tens, and 6 ones is equal to _____.

A) 564

B) 465

C) 456

D) 546

12)

1 hundred and 9 ones is equal to _____.

A) 19

B) 190

C) 109

D) 910

13)

4 hundreds and 8 ones is equal to _____.

A) 48

B) 84

C) 400

D) 408

14)

7 hundreds is equal to _____.

A) 700

B) 70

C) 7

D) 7,000

15)

8 hundreds is equal to _____.

A) 8,000

B) 800

C) 80

D) 8

16)

6 ones, 8 tens, and 1 hundred is equal to _____.

A) 681

B) 861

C) 168

D) 186

17)

5 thousands, 4 hundreds, and 6 ones is equal to _____.

A) 654

B) 546

C) 5,460

D) 5,406

18)

1 ten and 9 thousands is equal to _____.

A) 9,010

B) 9,000

C) 19

D) 91

19)

2 thousands is equal to _____.

A) 2

B) 20

C) 200

D) 2,000

20)

8 ones and 1 ten is equal to _____.

A) 81

B) 18

C) 801

D) 108

Estimation

Rounding to Nearest Ten

For questions 21 – 33, round each number to the nearest ten. It is also important that you memorize the rule for rounding.

21)

A) 50

B) 60

22)

A) 40

B) 50

23)

A) 20

B) 30

24)

A) 10

B) 20

25)

A) 10

B) 20

26)

A) 90

B) 100

27)

A) 0

B) 10

28)

A) 80

B) 90

29)

A) 50

B) 60

30)

A) 30

B) 40

31)

A) 40

B) 50

32)

A) 10

B) 20

33)

A) 80

B) 90

Estimation

Rounding to the Nearest 100.

For questions 34 – 45, round each number to the nearest hundred.

Consider rounding 149 to the nearest hundred by placing the number on the number line. Since 149 is closer to 100, 149 rounds to 100.

Rule: When rounding to the nearest 100, look at the ten to determine if you round to the lower or higher hundred. If the digit in ten’s place is 4 or lower, round to the lower hundred. If it is 5 or higher, round to the higher hundred.

In number 149, look at the ten. Four is lower than 5, so it will round to the lower hundred. 149 rounds to 100.

34)

235

A) 200

B) 300

35)

170

A) 100

B) 200

36)

871

A) 800

B) 900

37)

903

A) 900

B) 1,000

38)

689

A) 600

B) 700

39)

388

A) 300

B) 400

40)

555

A) 500

B) 600

41)

739

A) 700

B) 800

42)

412

A) 400

B) 500

43)

701

A) 700

B) 800

44)

699

A) 600

B) 700

45)

350

A) 300

B) 400

Estimating Size

When reading word problems, many times the question will ask ABOUT how many? This is when you use estimating by rounding to the nearest 10 or 100. For questions 46 – 60, carefully read these word problems and look for the key words to see if you need to estimate your answers.

46)

Jeff has 38 cows on his farm. To the nearest ten, how many cows does Jeff have?

A) 10

B) 20

C) 30

D) 40

47)

Jeff’s uncle clipped wool from 177 sheep. To the nearest hundred, how many sheep did he clip?

A) 100

B) 200

C) 300

D) 400

48)

Jeff’s aunt feeds 72 chickens and 21 pigs daily. About how many animals does she feed daily?

A) 70

B) 80

C) 90

D) 100

49)

The 3 horses on the farm drink 3 gallons of water each. About how many gallons do they drink altogether?

A) 0

B) 10

C) 20

D) 30

50)

Monday the chickens laid 33 eggs, Tuesday 21 eggs, Wednesday 44 eggs. About how many eggs were laid on Monday, Tuesday, and Wednesday?

A) 60

B) 70

C) 80

D) 90

51)

On Monday, 76 ears of corn were picked, Tuesday 81 ears were picked, Wednesday 86 were picked. If this pattern continues, how many ears would be picked on Thursday?

A) 89

B) 90

C) 91

D) 92

52)

In the previous question, about how many ears of corn were picked Mon., Tues., Wed., and Thurs?

A) 300

B) 200

C) 400

D) 500

53)

Mom picked 6 dozen ears of corn on Friday. About how many ears of corn did she pick?

A) 40

B) 50

C) 60

D) 70

54)

The corn that Mom picked was sold for $2.15 a dozen. About how much did Mom make on the corn that she picked on Friday?

A) $10

B) $20

C) $5

D) $6

55)

Jeff bought a fishing pole for $13.99 and a tackle box for $3.99. About how much did he spend in all?

A) $17

B) $18

C) $19

D) $20

56)

Jeff rented a fishing boat for $4 an hour. He fished for 7 hours. About how much did Jeff pay for the rental?

A) $10

B) $30

C) $50

D) $70

57)

Jeff caught 12 blue gill, 4 carp, and 7 catfish. About how many fish did he catch in all?

A) 0

B) 10

C) 20

D) 30

58)

Mom cooked the 4 carp for dinner and froze the rest of the fish from the previous question. About how many fish did Mom freeze?

A) 0

B) 10

C) 20

D) 30

59)

Mom fried the fish for 45 minutes. About how long did she fry the fish?

A) About 1 hour

B) About 2 hours

C) About 3 hours

60)

Mom made a cake to eat for dessert. It baked in the oven for 35 minutes and then had to cool for 15 minutes before she could ice the cake. About how long did it take before she could ice the cake?

A) About 1/2 an hour

B) About 1 hour

C) About 2 hours

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