1. Adding Decimal Numbers
5.M.NBT.07 Add, subtract, multiply, and divide decimals to hundredths using concrete models or drawing and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used

2. Essential Questions What is addition? How do you add decimals?
What is the thousandth place? How does place value affect value?
What about those whole numbers? Where is that hidden decimal?

3. Objective
I can add decimals to the thousandths place using models or drawings

4. 15.678 Let’s Review PART of a WHOLE Think back to last week...
What is a decimal number?
Talk to your neighbor and see if you can agree on an answer.
PART of a WHOLE
PART
WHOLE
15.678
Separated by a
decimal point!!

5. Adding and Subtracting Decimals
Adding Decimals...
.345 +
.87
Step 1: LINE-UP the decimals so there are right on top of each other.
Most Important Step in
Adding and Subtracting Decimals

6. Adding Decimals...
Step 2: Add in any necessary place holding zeros to EVEN THE PLAYING FIELD.
.345
+ .87

7. Adding Decimals... .345 + .87 12 1 5 1 Step 3: Add as Usual12 1 5
Step 4: Bring the Decimal STRAIGHT DOWN!!

8. Partner Practice .37 + .501 = .871 .45 + .1 = .55 *Challenge*=
.66823

9. What About Those Whole Numbers
Whole numbers can be a little bit tricky...
Remember...EVERY NUMBER HAS A DECIMAL, SOMETIMES IT IS JUST HIDDEN.
If you don’t see the decimal in the number, it is hidden at the end! 8 12
345
9,999

10. Adding With Whole Numbers...
The steps are the same,
just don’t forget the hidden decimal.
25.
+ 1.23 00
25 = 25.
26 23
Line up the decimals
Place holding zeros
Add as usual
Bring the Decimal Straight Down

11. Adding with models
=12.065

12. Your turn 3.35 2.52 5.87 What decimal is represented by each model?
Add the two together. What do you get?
3.35
2.52
5.87

13. Let’s try a few on your slates... with drawing pictures and models
Guided Practice =
1.226
15.45 = =
5.547

14. Closure
On your slate, create a word problem that requires adding of decimal numbers.
Pass your slate to the right and solve your neighbors problem.
Pass back and check your neighbors work.
Repeat todays objective

15. Independent Practice 3.45 + .568 57.89 + .00567 .0045 + 2.09