Adding and Subtracting Decimal Numbers with Model

Write the addition equation for the problem shown on the number line?

Subtracting Decimals: Use the grid method to subtract 0.3 from 0.7

• 0.6

• 0.5

• 0.4

• 0.8

Does this model represent addition or subtraction?

• addition

• subtraction

Match the following models with the correct addition and subtraction expressions.

• -4 - (-7)

• 
• -4 + 7

• 
• 7 + (-4)

• 
• 7 - 4

• 
• 4-7

• 

Answer explanation

Order matters in models! Be sure to look at where the expression begins.

Adding Decimals: Use the grid method to add 0.6 and 0.4

• 0.8

• 1.0

• 0.2

• 1.5

You bought some chips and paid with this amount. How much did the chips cost?

• $1.62

• $0.62

• $2.62

• $2.82

Subtracting Decimals: Use the grid method to subtract 0.5 from 0.9

• 0.3

• 0.7

• 1.2

• 0.4

The model above is shaded to represent a number greater than 1.

Which decimal represents this number?

• 3.9

• 39.0

• .39

• 3.09

What is the value of the decimal base ten blocks?

• 5.06

• 5.06

• 0.56

• 56.0

Draw this model on your paper.

Find 198 - 159 = ?

• 47

• 49

• 41

• 39