Adding and Subtracting Decimal Numbers with Model

You received this much change after paying with a $5 bill.  How much was your total?

• $1.68

• $1.78

• $3.22

• $4.22

Which of the following represents the amount shaded in the model?  

• 1.09

• 1.9

• 1.99

• 1.009

Add to find the __________

• part

• difference

• sum

What is the sum represented in the model?

What decimal numbers do the money pieces represent? 

• 3.39 and 4.06

• 3.49 and 4.60

• 3.13 and 4.006

• 3.94 and 4.t6

What decimal does the model show?

• 2.5

• 25

• 20.5

• 2.05

What operation does this model show?

• Adding 

• Subtracting

• Mutliplying

• Dividing

What is the sum of 0.04 + 0.05?

• 9

• 0.9

• 0.09

• 0.0009

What is the sum of 0.57 + 1.33?

• 90

• 1.10

• 0.90

• 1.180

When adding or subtracting decimals, what should you do?

• Line up the decimal points and add 0s to the empty spots.

• You just add or subtract.