Lesson: Adding Decimals
Lesson Objective
Lesson Plan
State Standard: 
5.NSOE.23 
Standard Name: 
Adding Decimals 
Objective: 
SWBAT find the sum and difference of decimals

Essential Question: 
Why is place value of a digit important? 
Word Wall Words: 
sum 
Do Now: 
32.955 + 9.86 
Opening: 
Today, we are going to talk about the numbers you multiply together to get a product.

Direct Instruction: 
When we are adding and subtracting numbers with decimals, we must line up our decimal points. Fill in zeros where numbers extend. Teach students to “Keep it Organized” 
Guided Practice: 
There is more than one way to do this. Show traditional algorithm and partial sums algorithm. Ask students if they do it a different way. 
Independent Practice: 
For these problems, it’s okay for you to do it however you are comfortable but you must show your work so I can understand how you are reaching your answer. 
Math Journal: 
In what other situations can estimating help you? 
Closing: 
Why do mathematicians line up decimal points when finding the sum and difference of numbers? 
Center Options: 
Give students a menu. They must select items to eat and drink. They will first estimate the cost, then figure out the exact cost. Then they will figure out the change out of $75.00. Students will change papers and check each other’s work for accuracy. 
Differentiation: 
Low: have them select fewer items; work with a partner. Model how to draw lines between place values to organize problems color code if helpful High: select more items, make change from a larger amount 
Lesson Resources
Add Decimals Practice Classwork 
581

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