Decimal Computation:
Applying Whole Number Addition and Subtraction Strategies
Grade 4
Unit 4: Decimals
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Materials you will need...
What is the same? What is different?
52+48
50+40=90
2+8=10
90+10=100
5.2+4.8
5.0+4.0=9.0
0.2+0.8=1.0
9.0+1.0=10
Same but Different
Same | Different |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
It is the same because | It is different because |
Me too
I’m Wondering
A new idea
Bakery Sales
Piece of Cake Bakery sold 403 chocolate cupcakes and 128 vanilla cupcakes on Saturday! How many cupcakes did they sell altogether?
Bakery Sales
Piece of Cake Bakery sold 403 chocolate cupcakes and 128 vanilla cupcakes on Saturday! How many cupcakes did they sell altogether?
Consider how the strategies you used for this problem can help you with the next problem...
Buying Baked Goods
Jenna and Jamie combined their money to buy some baked goods! Jenna has $4.03 and Jamie has $1.28. How much money do they have to spend at the bakery?
=1
These cloned base ten blocks are also here if you need them.
Use cloned tick mark for number line
Name: ________________
Solve using the tools and strategy that works best for you.
Student #1’s Strategy
Student #2s Strategy
What is the same? What is different?
403+128
400 + 100= 500
3+ 28= 31
500+31=531
4.03+1.28
4.00+1.00= 5
0.03+ 0.28= 0.31
5+0.31=5.31
How can the strategies you use to add whole numbers help you to add decimals?
How can the strategies you use to add whole numbers help you to add decimals?
How can the strategies you use to add whole numbers help you to add decimals?