Section 2 - Rounding and Estimating Numbers

Question 1

What is rounding?

Answer 1

Rounding is the process of adjusting a number to make it simpler while retaining its value.

Question 2

True or False: Rounding can only be done to whole numbers.

Answer 2

False

Question 3

Round 67.8 to the nearest whole number.

Answer 3

68

Question 4

What is the rule for rounding up when the digit is 5 or greater?

Answer 4

Increase the last retained digit by 1.

Question 5

Round 3.14159 to two decimal places.

Answer 5

3.14

Question 6

Fill in the blank: The number 4.6 rounded to the nearest whole number is ____.

Answer 6

5

Question 7

What does it mean to estimate a number?

Answer 7

Estimating a number involves finding a value that is close enough to the exact value for practical purposes.

Question 8

True or False: Estimating can help simplify calculations.

Answer 8

True

Question 9

What is the estimated sum of 47 and 38 when rounded to the nearest ten?

Answer 9

80

Question 10

Round 245 to the nearest hundred.

Answer 10

200

Question 11

What is the first step in rounding a number?

Answer 11

Identify the place value to which you want to round.

Question 12

Round 89.999 to the nearest whole number.

Answer 12

90

Question 13

Fill in the blank: When rounding 2.4 to the nearest whole number, you round ____.

Answer 13

down to 2

Question 14

Which of the following is the correct estimate for 123 + 456? (A) 500 (B) 600 (C) 700

Answer 14

C) 600

Question 15

Round 1,234 to the nearest thousand.

Answer 15

1,000

Question 16

What is the rounding rule for numbers less than 5?

Answer 16

Leave the last retained digit unchanged.

Question 17

True or False: Rounding can change the value of a number.

Answer 17

True

Question 18

Estimate the product of 9.8 and 3.2 by rounding.

Answer 18

30

Question 19

Round 0.567 to two decimal places.

Answer 19

0.57

Question 20

Fill in the blank: The number 76.4 rounded to the nearest ten is ____.

Answer 20

80

Question 21

What is the rounded value of 250.5 to the nearest ten?

Answer 21

250

Question 22

Round 1.49 to the nearest whole number.

Answer 22

1

Question 23

Estimate the sum of 215 and 368 when rounded to the nearest hundred.

Answer 23

600

Question 24

What is the rounded value of 4.75 to one decimal place?

Answer 24

4.8

Question 25

True or False: Rounding always results in a smaller number.

Answer 25

False

Question 26

What is the estimated difference between 500 and 275 rounded to the nearest hundred?

Answer 26

400

Question 27

Round 12.345 to three decimal places.

Answer 27

12.345

Question 28

Fill in the blank: To round 8.3 to the nearest whole number, you would round ____.

Answer 28

up to 8

Question 29

What is the estimated quotient of 250 divided by 5 when rounded?

Answer 29

50

Question 30

Round 99.5 to the nearest whole number.

Answer 30

100

Question 31

Which number is closer to 300: 295 or 305?

Answer 31

Both are equally close.

Question 32

Round 1.999 to the nearest whole number.

Answer 32

2

Question 33

Estimate the total of 89 and 23 rounded to the nearest ten.

Answer 33

110

Question 34

Fill in the blank: The number 6.7 rounded to the nearest whole number is ____.

Answer 34

7

Question 35

What is the rounding rule for the number 5?

Answer 35

Round up if it is followed by a non-zero digit; otherwise, round down.

Question 36

Round 532 to the nearest ten.

Answer 36

530

Question 37

What is the estimated total of 15.4 + 20.6?

Answer 37

36

Question 38

True or False: Estimation is only used in mathematics.

Answer 38

False

Question 39

What is the rounded value of 0.044 to two decimal places?

Answer 39

0.04