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Round Off Form 1

This document discusses how to round decimals to different levels of precision. It provides examples of rounding decimals to the nearest whole number, one decimal place, two decimal places, and three decimal places. To round, you look at the digit in the place being rounded to and round up if it is 5 or greater, round down if it is less than 5. The examples demonstrate this process and what place value to discard when rounding to each level of precision. Exercises are also provided for the reader to practice rounding decimals in different scenarios.

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Pierre D' Rossie
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927 views12 pages

Round Off Form 1

This document discusses how to round decimals to different levels of precision. It provides examples of rounding decimals to the nearest whole number, one decimal place, two decimal places, and three decimal places. To round, you look at the digit in the place being rounded to and round up if it is 5 or greater, round down if it is less than 5. The examples demonstrate this process and what place value to discard when rounding to each level of precision. Exercises are also provided for the reader to practice rounding decimals in different scenarios.

Uploaded by

Pierre D' Rossie
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPS, PDF, TXT or read online on Scribd
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4.

DECIMALS
Rounding
Rounding Off
Off

Rounding Off Decimals


Decimals can be rounded off to a given
number of decimal places.
Whole Number

Round off a decimal


nearest to,

1 decimal place

2 decimal places

3 decimal places

Rounding Off Decimals Nearest to Whole Number

Example 1:

3.3

To round 3.3 to whole number, we look at


the first digit after decimal point.

3.3

3.3

The first digit after decimal point is 3. 3 is less than 5,


so we round by down discarding the decimal and the
digit to the right of the decimal point.

3.3 is nearer to 3 than 4, so 3.3 3

Rounding Off Decimals Nearest to Whole Number


Example 2: 5.8
To round 5.8 to whole number, we look at the first digit
after decimal point.
+1

5.8

5.8

The first digit after decimal point is 8. 8 is greater than 5, so


we round up the decimal by adding 1 to 5 and discarding the
decimal point and all digits to the right of the decimal point.

5.8 is nearer to 6 than 5, so 5.8 6

Rounding Off Decimals Nearest to 1 Decimal Place


Example 1: 9.329
To round 9.329 to 1 decimal place, we look at the second
digit after decimal point.

9.329

9.3

The second digit after decimal point is 2. 2 is


less than 5, so we round down the decimal by
discarding all the decimal places after number 2.

So, 9.329 9.3 ( 1 decimal place )

Rounding Off Decimals Nearest to 1 Decimal Place


Example 2: 6.476
To round 6.476 to 1 decimal place, we look at the second
digit after decimal point.
+1

6.476

9.476

9.576

9.5

The second digit after decimal point is 7. 7 is greater


than 5, so we round up the decimal by adding 1 to
number 4 and discarding all the decimal places after
number 7.

So, 6.476 6.5 ( 1 decimal place )

Rounding Off Decimals Nearest to 2 Decimal Places


Example 1: 23.574
To round 23.574 to 2 decimal places, we look at the third
digit after decimal point.

23.574

23.574

23.57

The third digit after decimal point is 4. 4 is


less than 5, so we round down the by
discarding the decimal place after number 7.

So, 23.574 23.57( 2 decimal places )

Rounding Off Decimals Nearest to 2 Decimal Places


Example 2: 15.889
To round 15.889 to 2 decimal places, we look at the third
digit after decimal point.
+1

15.889

15.889

15.896 15.89

The third digit after decimal point is 9. 9 is


greater than 5, so we round up the decimal by
adding 1 to 8 and discarding the decimal point
and all digits to the right of the decimal point.

So, 15.889 15.89 ( 2 decimal places)

Rounding Off Decimals Nearest to 3 Decimal Places


Example 1: 2.1983
To round 2.1983 to 3 decimal places, we look at the fourth
digit after decimal point.

2.1983

2.1983

2.198

The fourth digit after decimal point is 3. 3 is less


than 5, so we round down by discarding the
decimal place after number 8.

So, 2.1983 2.198( 3 decimal places )

Rounding Off Decimals Nearest to 3 Decimal Places


Example 2: 7.1239
To round 7.1239 to 3 decimal places, we look at the fourth
digit after decimal point.
+1

7.1239

7.1239

7.1249 7.124

The fourth digit after decimal point is 9. 9 is


greater than 5, so we round up the decimal by
adding 1 to 3 and discarding the decimal point and
all digits to the right of the decimal point.

So, 7.1239 7.124 (3 decimal places)

EXERCISE
EXERCISE 11

Round off 34.9846 to,


a) Whole number

35

b) 1 decimal place

35.0

c) 2 decimal places

34.98

d) 3 decimal places

34.985

EXERCISE
EXERCISE 22

Write 9.7053 correct to ,


a) Nearest whole number

10

b) 1 decimal place

9.7

c) 2 decimal places

9.71

d) 3 decimal places

9.705
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