Adding and Subtracting Decimals
Adding Decimals
Step 1: Rewrite the Problem by
LINING UP the decimal
Step 3: Add the numbers in each
column
$ 3.27
$ 2.79
$ 6.85
Total Amount Spent
3.27
6.85
2.79
4.30
How much more money does Guadalupe need?
HOW WOULD THE PROCESS CHANGE IF WE WERE TO SUBTRACT?
What Did You Do?
How did you find the total amount of money spent?
What was the location of your decimal?
Why did you place your decimal there?
EXAMPLE 2
143.98 + 27.32
Q.T. Snack Run
If you were to buy 1 bag of hot cheetos and 1 can of Pepsi, how much would you spend?
Example: 3.2 + 8.67 =
3.2
+ 8.67
Step 2: Fill in missing place values with a 0
3.2
+ 8.67
0
2.5
+ 3.67
0
7
1
6
.
1
FINAL ANSWER
6.17
1's talk with 2's
3's talk with 4's
Subtracting Decimals
Write in your comp book.
Example: 5.42  2.91
Step 1: Rewrite the problem by LINING UP the decimal
5.42
 2.91
Step 2: Fill in any missing place values with a zero.
Step 3: Subtract the numbers in each coloumn. Borrow if needed.
5.42
 2.91
1
5
2
.
4 14
FINAL ANSWER
2.51
Write in your comp book.
9.64 + 3.115 =
Example 1
Example 1
12.97  8.2 =
Example 2
43.178  21.24 =
1's talk with 2's
3's talk with 4's
WHITE BOARD!!
Please take out your white board and a marker.
Guadalupe is going to the store to buy some items.
As she buys the items, be sure to write the price on your white board.
$ 4.30
Guadalupe only has $16.50. Does she have enough money to buy all the items?
How much money did Guadalupe spend total?
+
2
2

17.21
Amount Spent
Allowance
7
16.50
Amount Needed
In pairs, you are going to work as a team to complete Grandma Lou's Shopping List. Each day she sends you to WalMart to buy a list of items. However she only sends you with $12.50 to buy all the items.
You must calculate:
the cost of all items in the list
how much money you have left over
how much more money you need
If you
have enough
money you will color the
box
green
.
If you
do not have enough
money you will color the
box
red
.
EXIT TICKET
PLEASE GET OUT YOUR PRIVACY FOLDERS!
YOU HAVE 7 QUESTIONS YOU NEED TO COMPLETE.
THE WORD PROBLEMS MUST BE SOLVED USING THE PENCIL STRATEGY.
YOU MUST SHOW ALL WORK TO RECEIVE CREDIT
EXCEEDS
100  90 %
FFB
59 
APPROACH
75  60 %
MEETS
80  75 %
When you are finished:
1. Turn your exit ticket into the wall
2. Collect your homework from the back table
3. Begin homework or silent read
9.64
+ 3.115
REWRITE
0
FILL IN GAPS WITH ZEROS
FILL IN THE GAP
FILL IN THE GAP
5
5
7
.
12
ADD THE NUMBERS IN THE COLUMN
143.98
+ 27.32
0
0
1
7
1
3
.
REWRITE
FILL IN THE GAPS
ADD THE NUMBERS IN THE COLUMN
1
1
1
QT Price List
Hot Cheetos $1.23
Can of Pepsi .94 cents
12.97
 8.2
REWRITE
FILL IN THE GAPS
SUBTRACT THE NUMBERS IN THE COLUMN
0
7
7
4
43.178
 21.24
REWRITE
FILL IN THE GAPS
0
SUBTRACT THE NUMBERS IN THE COLUMN
8
3
9
.
1
2
2 11
BORROW IF NEEDED
BORROW IF NEEDED
**
Were you able to buy all the items you need?
What allowance would you have needed everyday to buy all the items you needed?
DONT FORGET YOUR SELF CHECK
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
5 feeling great
I could teach my partner
4 feeling good
ready to move on
3 feeling okay
need some more practice
2 feeling confused
need more practice
1 feeling completely lost
need a lot more practice
.
1
2
.
7
1
1
.
ADDING AND SUBTRACTING DECIMALS
PLEASE PUT YOUR WHITE BOARDS AND MARKERS AWAY
In PAIRS Discuss:
DID WE ACHIEVE OUR GOALS??
Agree
Disagree
OR
Determine the operation needed to solve a problem. How?
Properly set up an addition and subtraction problem with decimals. How?
Calculate the sum and difference of multidigit decimals. How?
Write in your comp book.
Write in your comp book.
Write in your comp book.
Write in your comp book.
WHITE BOARD!!
WRITE IN YOUR COMP BOOK
HEADER:
Determine the operation
needed to solve a problem.
Properly set up an addition and subtraction problem with decimals.
Calculate the sum and difference of multidigit decimals.
I CAN...
CIRLCLE
1 2 3 4
HOLD BOARD UP TO SHOW ANSWER WHEN FINISHED
HOLD BOARD UP TO SHOW ANSWER WHEN FINISHED
WHY?
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Adding and Subtracting Decimals
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