Adding and Subtracting Decimals using Models

When modeling decimals, which of the following can represent one whole?

• A large cube

• A large square grid

• Both a large cube and a large square grid

• Neither a large cube nor a large square grid

If a large purple cube represents one whole, what represents one tenth?

• A green flat

• A blue rod

• An orange unit cube

• A small square grid

If a large square grid represents one whole, what represents one hundredth?

• A single small square

• A column of 10 small squares

• A 10x10 grid

• A 10x10x10 cube

What decimal is represented by the shaded portion of the grid shown?

• 0.04

• 0.4

• 4.0

• 0.004

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What decimal is represented by one fully shaded grid and 57 shaded squares in a second grid?

• 1.057

• 1.57

• 0.157

• 1.75

If a decimal model shows 89 out of 100 squares shaded in a single grid, what decimal is represented?

• 0.089

• 0.809

• 0.89

• 8.9

What is the sum of 0.4 and 0.83 when using decimal models?

• 1.13

• 1.23

• 0.123

• 1.43

What is the difference when 0.89 is subtracted from 1.57 using decimal models?

• 0.78

• 0.68

• 0.58

• 0.48