Transcript UW.5.M.NBT.07 Add, subtract, multiply, and divide decimals

Subtracting Decimals
UW.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
Essential Questions
• 1.
What are decimal numbers? How do we
subtract decimals?
• 2.
What is place value to the thousandths?
How does the place value of a number
effect its value?
Objective
•I
can subtract decimals to the
thousandths place using models
or drawing
Subtracting Decimals is as
easy as 1..2..3...
1. Line up the decimals!
2. Fill in the blank spots with zeros!
3. Subtract like normal
4.Bring down the decimal!
Watch....
•
How about.....
•
When you don’t see the decimal it is
invisible and you find it behind the
whole number. Therefore,
•
6. - 2.3
6 - 2.3
6.
2.3
• 2) Then fill in the empty spots with zero
(have to make the teams even or it’s not
fair!)
6.0
-2.3
• 3) Then subtract! 3.7
•
1) Line ‘em up!
6.0
2.3
LEts do one together...
• 4.032
- 2.39
Now You Try....
•
5.64 - 4
Now You Try with your
partner
• 9.20
- 3.491
Subtracting With Models
using more models
Now You Try Using Models
or drawing a picture....
• 12.3
- 4.502
Now You Try with a partner
with drawing a model....
• 50.321
- 4.2
• Think...
Closure
what are the steps for
subtracting decimals?
• How
are they similar to addition?
• Share
with your face partner
• Please
rewrite the objective for
today on you whiteboard
Independent Practice
•
3.45 - .568
•
57.89 - .00567
•
2.09 - .0045
•
306.09 - .75
•
12.009 - 7.90
•
1.00005 - .998
•
2.05 - .00902
•
3.0079 - 2.98