Transcript Place Value & Decimal Review

Place Value
&
Rounding Review
Place Value
Place
Value
For the number 2,641.25 :
The 2 is in the ___ place.
The 6 is in the ___ place.
The 4 is in the ___ place.
The 1 is in the ___ place.
The 2 is in the ___ place.
The 5 is in the ___ place.
Rounding
Whole Numbers
Use the term rounding digit - which means:
When asked to round to the closest tens - your
rounding digit is the second number to the left (ten's
place) when working with whole numbers.
Example: 345 the underlined 4 is the rounding digit.
Rounding
Whole Numbers
Use the term rounding digit - which means:
When asked to round to the nearest hundred - the
third place from the left is the rounding digit
(hundreds place).
Example: 345 the underlined 3 is the rounding digit.
Rules for rounding
whole numbers
Rule 1: Determine what your rounding
digit is and look to the right side of it.
If the digit is 0,1,2,3 or 4 do not change
the rounding digit.
All digits that are on the right hand side of
the requested rounding digit will become
0.
Rules for rounding
whole numbers
For example:
2.64 = 2.6
The four is less than five so we
will drop it.
Rules for Rounding
whole numbers
Rule 2. Determine what your rounding
digit is and look to the right of it.
If the digit is 5,6,7, 8 or 9, your
rounding digit rounds up by one
number.
All digits that are on the right hand side
of the requested rounding digit will
become 0
Rules for rounding
whole numbers
For example:
2.694 = 2.7
The nine is more than five so we will add
one to the rounding digit.
Rules for rounding
decimal numbers
When rounding numbers involving decimals, there are
2 rules to remember:
Rule 1: Determine what your rounding digit is and
look to the right side of it.
If that digit is 4,3, 2 or 1, simply drop all digits to the
right of it.
Rules for rounding
decimal numbers
For Example:
if rounding to the nearest tenth of
6.422,
the 4 becomes our rounding digit, the 2 to the right of it
is less than 5, so we simply drop all the digits behind it.
6.422 to the nearest tenth is 6.4
Rules for rounding
decimal numbers
Rule 2: Determine what your rounding digit is and
look to the right side of it.
If that digit is 5, 6, 7, 8 or 9 add one to the rounding
digit and drop all digits to the right of it.
Rules for rounding
decimal numbers
For Example:
if rounding to the nearest tenth of
6.573,
The 5 becomes our rounding digit, the 7 to the right of it
is more than 5, so we simply add one to the rounding
digit.
6.573 to the nearest tenth is 6.6