Round whole numbers

When we don’t need exact results, we often round numbers
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Questions #: 10
Time: 10 minutes
Pass Score: 80.0%
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Ordering textbooks

 

rounding_up.gif

A teacher with 36 students orders 40 textbooks, he has rounded the actual number to the
nearest ten because 36 is closer to 40 than it is to 30.  We say 36, rounded to the nearest
10, is 40. This process is called _________

POINTS (1)

Correct Answer

Explanation

Height of Alaska's Mount McKinley

 

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When a geologist says that the height of Alaska’s Mount McKinley is “about 20,300 feet,” she has rounded to the nearest hundred because its actual height of 20,320 feet is closer to 20,300 than it is to 20,400. We say that 20,320, rounded to the nearest hundred, is 20,300. This process is called _________.

POINTS (1)

Correct Answer

Explanation

What is it when we round a whole number?

When we round a whole number, we are finding an of the number. An is close to, but not the same as, the exact value.

POINTS (1)

Correct Answer

Explanation

To round a number to the nearest ten

We locate the in the tens column.  If the to the right of that column (the digit in the ones column) is 5 or greater, we round by increasing the tens digit by 1 and replacing the with 0.  If the is less than 5, we round by leaving the tens digit unchanged and replacing the with 0

drag and drop the selected option to the right place or type it instead
up
rounding digit
test digit
down
POINTS (1)

Correct Answer

Explanation

Identify the rounding digit and the test digit in the following number in order to round it to the nearest ten

3,761

rounding digit

test digit

POINTS (1)

Correct Answer

Explanation

Round each number to the nearest ten

  1. 3,761
  2. 12,087

Write the numbers only without the comma separator

POINTS (1)

Correct Answer

Explanation

Rounding a Whole Number

  1. To round a number to a certain place value, locate the rounding digit in that place.
  2. Look at the test digit, which is directly to the right of the rounding digit.
  3. If the test digit is 5 or greater, round up by adding 1 to the rounding digit
    and replacing all of the digits to its right with 0.
  4. If the test digit is less than 5, replace it and all of the digits to its right with 0.
Acknowledge
POINTS (1)

Correct Answer

Explanation

Round each number to the nearest hundred

  1. 18,349
  2. 7,960

Write the rounded numbers without the separating comma

POINTS (1)

Correct Answer

Explanation

To round a number, use only the test digit directly to the right of the rounding digit to determine whether to round up or round down

POINTS (1)

Correct Answer

Explanation

US Cities

Denver

CITY LIMIT

Pop. 588, 349   Elev. 5,280

In 2007, Denver was the nation’s 26th largest city.  Round the 2007 population of Denver shown above

  1. the nearest thousand
  2. the nearest hundred thousand

Write rounded numbers without the separating commas

POINTS (1)

Correct Answer

Explanation

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± RND C = MC

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