Add and Subtract Decimal Models

16.3 - 4.156

• 12.244

• 12.454

• 12.144

• 13.144

What is the rule for adding or subtracting decimals?

• Add first

• Line up the decimals first, then fill in with zeros.

• Move the decimal to the right the total amount of numbers after the decimal.

• Subtract

True or false: The blocks show the decimal numbers of 6.47 + 3.26.

• False

• True

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

• 0.3

• 0.7

• 1.2

• 0.4

Does this model represent addition or subtraction?

• addition

• subtraction

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 0.3 from 0.7

• 0.6

• 0.5

• 0.4

• 0.8

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

Which decimal represents this number?

• 3.9

• 39.0

• .39

• 3.09

Write the decimal value of the coins