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**Modeling Decimals with Base 10 Blocks**

Joyce Bishop

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**Using Familiar Base 10 Blocks to Model Decimal Numbers**

flat = 1 long = 0.1 small cube = 0.01 small flat = 0.001

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**Representing Decimal Numbers**

Base 10 blocks Decimal Fraction Representation Representation 2.6

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**Representing Decimal Numbers**

Base 10 blocks Decimal Fraction Representation Representation 3.217

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Comparing Decimals Represent each of the following numbers with base 10 blocks and put them in order from smallest to greatest:

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Comparing Decimals

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Model Space Ship Ethan is constructing a model of a space ship. The first stage is 2.34 meter tall. The second stage is meters tall. What is the total height? Model the solution with base 10 blocks.

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**Model Space Ship - Addition**

2.34 1.031 = (3 x 1) + (3 x 0.1) + (7 x 0.01) + (1 x 0.001)= 3.371

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Representing Two Ways Use your understanding of place value to show two ways to represent 0.18 with base 10 blocks.

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Representing Two Ways Use your understanding of place value to show two ways to represent 0.18. or √

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**Storing a Model Space Ship**

Ethan has another model space ship that is 1.62 meters tall. If he stores it in a cabinet that is 2.18 meters tall, how much taller is the cabinet than the model space ship? Model your solution with base 10 blocks.

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**Storing a Model Space Ship - Subtraction**

2.18 Rename 1 as 10 x 0.1

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**Storing a Model Space Ship - Subtraction**

2.18

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**Storing a Model Space Ship - Subtraction**

2.18 2.18 m – 1.62 m = 0.56 m

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**Multiplying Decimals Using an Understanding of Place Value**

Using Place Value Materials (With Renaming) 1.6 x 2 2 groups of 1.6 Include mult & div problem types from CCSSM in handout. Edited version in PowerPoint.

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**Multiplying Decimals Using an Understanding of Place Value**

Using Place Value Materials (With Renaming) 1.6 x 2 Trade to make another unit. 1.6 x 2 = 3.2

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**Multiplying a Decimal by a Decimal**

1.6 x .2 Find two tenths of each part. Include mult & div problem types from CCSSM in handout. Include edited version in PowerPoint.

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**Multiplying a Decimal by a Decimal**

1.6 x .2 Find two tenths of each part (not drawn proportionally.) Include mult & div problem types from CCSSM in handout. Include edited version in PowerPoint. xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx

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**Multiplying a Decimal by a Decimal**

1.6 x 0.2 1.6 x 0.2 = (2 x 0.1) + (12 x 0.01) Include mult & div problem types from CCSSM in handout. Include edited version in PowerPoint. xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx

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**Multiplying a Decimal by a Decimal**

1.6 x 0.2 1.6 x 0.2 = (3 x 0.1) + (2 x 0.01) = 0.32 Include mult & div problem types from CCSSM in handout. Include edited version in PowerPoint. xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx xxxxxxx

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**One Multiplicative Situation: Two Division Types**

Aeisha is cutting ribbon for a hair bow. She has 1.2 meters of ribbon. Each piece of ribbon must be 0.3 meters long. She can cut 4 pieces of ribbon. Two division questions: You know how long each piece of ribbon must be. How many pieces can you cut? (Measurement Division) You know how many pieces of ribbon you need. How long is each piece? (Partitive or Sharing Division)

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? Rename 1.0 as (10 x 0.1)

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? Count groups of (3 x 0.1).

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? One group of (3 x 0.1).

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? Two groups of (3 x 0.1).

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? Three groups of (3 x 0.1).

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Measurement Division Aeisha has 1.2 meters of ribbon to use for a hair bow. Each piece of ribbon must be 0.3 meters long. How many pieces can she cut? Four groups of (3 x 0.1). 1.2 meters ÷ by 0.3 = 4

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**Partitive (Sharing) Division**

Aeisha has 1.2 meters of ribbon to make into a hair bow. If she wants to cut it into 4 pieces, how long will each piece be? Rename 1.0 as (10 x 0.1)

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**Partitive (Sharing) Division**

Aeisha has 1.2 meters of ribbon to make into a hair bow. If she wants to cut it into 4 pieces, how long will each piece be? Arrange the blocks in four equal groups.

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**Partitive (Sharing) Division**

Aeisha has 1.2 meters of ribbon to make into a hair bow. If she wants to cut it into 4 pieces, how long will each piece be? Four groups of 0.1 m with 0.8 m left.

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**Partitive (Sharing) Division**

Aeisha has 1.2 meters of ribbon to make into a hair bow. If she wants to cut it into 4 pieces, how long will each piece be? Four groups of 0.2 m with 0.4 m left.

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**Partititve (Sharing) Division**

Aeisha has 1.2 meters of ribbon to make into a hair bow. If she wants to cut it into 4 pieces, how long will each piece be? There are four groups with 0.3 meter in each. 1.2 meters ÷ by 4 = 0.3

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