Date post: | 06-Jul-2018 |
Category: |
Documents |
Upload: | pierre-d-rossie |
View: | 221 times |
Download: | 0 times |
of 12
8/17/2019 round off form 1
1/12
4. DECIMALS
Rounding Off
8/17/2019 round off form 1
2/12
Rounding Off Decimals
Decimals can be rounded off to a givennumber of decimal places.
Whole Number
1 decimal place
2 decimal places
3 decimal places
Round off a decimal
nearest to,
8/17/2019 round off form 1
3/12
Rounding Off Decimals Nearest to Whole Number
Eample 1! 3.3
"o round 3.3 to #hole number, #e loo$ atthe first digit after decimal point.
3.3
"he first digit after decimal point is 3. 3 is less than %,so #e round b& do#n 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
3.3
8/17/2019 round off form 1
4/12
Rounding Off Decimals Nearest to Whole Number
Eample 2! %.'"o round %.' to #hole number, #e loo$ at the first digit
after decimal point.
%.'
"he first digit after decimal point is '. ' is greater than %, so#e round up the decimal b& adding 1 to % 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
%.'(1
)
8/17/2019 round off form 1
5/12
Rounding Off Decimals Nearest to 1 Decimal *lace
Eample 1! +.32+"o round +.32+ to 1 decimal place, #e loo$ at the second
digit after decimal point.
+.32+
"he second digit after decimal point is 2. 2 isless than %, so #e round do#n the decimal b&
discarding all the decimal places after number 2.
So, 9.329 ≈ 9.3 ( 1 decimal place )
+.3
8/17/2019 round off form 1
6/12
Rounding Off Decimals Nearest to 1 Decimal *lace
Eample 2! ).-)"o round ).-) to 1 decimal place, #e loo$ at the second
digit after decimal point.
).-)
"he second digit after decimal point is -. - is greater
than %, so #e round up the decimal b& adding 1 to
number and discarding all the decimal places after
number -.
So, 6.476 ≈ 6.5 ( 1 decimal place )
+.-)(1
+.%-)
+.%
8/17/2019 round off form 1
7/12
Rounding Off Decimals Nearest to 2 Decimal *laces
Eample 1! 23.%-"o round 23.%- to 2 decimal places, #e loo$ at the third
digit after decimal point.
23.%-
"he third digit after decimal point is . is
less than %, so #e round do#n the b&
discarding the decimal place after number -.
So, 23.574 ≈ 23.57( 2 decimal places )
23.%- 23.%-
8/17/2019 round off form 1
8/12
1%.'+
Rounding Off Decimals Nearest to 2 Decimal *laces
Eample 2! 1%.''+
1%.''+
"he third digit after decimal point is +. + is
greater than %, so #e round up the decimal b&
adding 1 to ' and discarding the decimal point
and all digits to the right of the decimal point.
So, 15.889 ≈ 15.89 ( 2 decimal places)
1%.''+(1
"o round 1%.''+ to 2 decimal places, #e loo$ at the third
digit after decimal point.
1%.'+)
8/17/2019 round off form 1
9/12
2.1+'
Rounding Off Decimals Nearest to 3 Decimal *laces
Eample 1! 2.1+'3"o round 2.1+'3 to 3 decimal places, #e loo$ at the fourth
digit after decimal point.
2.1+'3
"he fourth digit after decimal point is 3. 3 is less
than %, so #e round do#n b& discarding the
decimal place after number '.
So, 2.1983 ≈ 2.198( 3 decimal places )
2.1+'3
8/17/2019 round off form 1
10/12
-.12
Rounding Off Decimals Nearest to 3 Decimal *laces
Eample 2! -.123+
-.123+
"he fourth digit after decimal point is +. + is
greater than %, so #e round up the decimal b&
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)
-.123+(1
"o round -.123+ to 3 decimal places, #e loo$ at the fourth
digit after decimal point.
-.12+
8/17/2019 round off form 1
11/12
EER/0E 1EER/0E 1
Round off 3.+') to,
a Whole number
b 1 decimal place
c 2 decimal places
d 3 decimal places
3%
3%.
3.+'
3.+'%
8/17/2019 round off form 1
12/12
EER/0E 2EER/0E 2
Write +.-%3 correct to ,a Nearest #hole number
b 1 decimal place
c 2 decimal places
d 3 decimal places
1
+.-
+.-1
+.-%
Return
http://4_decimals.ppt/