Round To The Nearest Tens - Definition with Examples

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Round to the Nearest Tens

Rounding

Rounding refers to the process of converting a particular number to an easy number. The rounded number is not exact but an estimate of the given number. 

Purpose of rounding

Usually, we round numbers for:

  1. Making calculations easy.
  2. Making the numbers easy to understand and remember.

Applications of rounding

Kids buying chocolate

Estimation: We use rounding to guess the most appropriate answer. Rounding is the process of estimation. 

For example, Samantha wants to buy chocolates for $97. She can estimate the amount to the nearest tens and give $100. The shopkeeper will return Samantha $3.

Estimation helps us to calculate easily.

Rounding Numbers to the nearest tens

We can follow the given steps to round numbers to the nearest tens:

Step 1- We look at the number we want to round.

Step 2- As we are rounding the number to the nearest tens, we mark the digit in the tens column.

Step 3- Now we look at the ‘ones’ column (the digit to the right of the tens column).

Step 4- (i) If the digit in the one's column is 0, 1, 2, 3 or 4, we will round down the tens column to the nearest tens.

            (ii) If the digit in the one's column is 5, 6, 7, 8 or 9, we will round up the tens column to the nearest tens.

Step 5- Write ones digit as 0 and remove all the digits after the one's column. The left out number is our desired answer.

 

Example 1: Round 524 to the nearest ten.

Step Number

 Observation

 Working Out

Step 1

 524

 

Step 2

 We get 2 in the tens column.

 

Step 3

 We get 4 in the one's column (right of 2)

 

Step 4

 We get 4 in Step 3.

 Round-Down

Step 5

 520

We keep 2 as it is and write ones digit as 0 and remove all the digits from the right of the one's column.

 

Example 2: Round 117.32 to the nearest tens.

Step Number

Observation

Working Out

Step 1

 117.32

 

Step 2

 We get 2 in the tens column.

 

Step 3

 We get 7 in the one's column (right of 1)

 

Step 4

 We get 7 in Step 3.

 Round-Up

Step 5

 120

We add 1 to the 1 at tens place and write one's digit as 0 and remove all the digits from the right of the one's column.

 

Example 3: Tom is 149 cm tall. Write his height in the nearest tens?

measure height

 

 

 

 

 

 

 

 

 

Step Number

Observation

Working Out

Step 1

 149

 

Step 2

 We get 4 in the tens column.

 

Step 3

 We get 9 in the one's column (right of 4)

 

Step 4

 We get 9 in Step 3.

 Round-Up

Step 5

 150

We add 1 to 4 at the tens place and write one's digit as 0 and remove all the digits from the right of the ones column

 

Exception case: 

Example 4: Round the number 199.278 to the nearest tens.

Step Number

Observation

Working Out

Step 1

 199.278

 

Step 2

 We get 9 in the tens column.

 

Step 3

 We get 9 in the one's column (right of 9)

 

Step 4

 We get 9 in Step 3.

 Round-Up

Step 5

 200

We add 1 to 9 and carry 1 to hundreds column and write one's digit as 0 and remove all the digits from the right of the one's column.

 

Example 5: A park measures 249.9 meters in length. How long is the park to the nearest 10 meters?

area-of-park

Step Number

Observation

Working Out

Step 1

 249.9

 

Step 2

 We get 4 in the tens column.

 

Step 3

 We get 9 in the one's column (right of 4)

 

Step 4

 We get 9 in Step 3.

 Round-Up

Step 5

 250

We add 1 to 4 and write ones digit as 0 and remove all the digits from the right of the ones column.

 

  Fun Fact

  • Around the world, a few retail outlets set their prices like $99, $199, $0.99, $9.99, etc. This is done because generally, people read from left to right, resulting in the first number striking in our head. Because of this, we tend to think that the prices are cheaper. 

 

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