NBT B 5

Envision 4-5 Multiplying Decimals with Models

Warm Up

Let's review what we did yesterday!

Multiple Choice

What is the equation for the decimal multiplication model?

• 25 x 8 =200
• 0.25 x 8 = 0.20
• 0.8 x 25 = 2.0
• 8 x 0.25 = 2.00

Multiple Choice

How many groups are in this model? 

• 1
• 2
• 3
• 4

Multiple Choice

Which equation matches the model?

• 2 x 0.3 = 0.6
• 3 x 0.2 = 0.6
• 2 x 3 = 0.6
• 3 x 2 = 6

Talk it out!

Use the slide handout to color along.

Multiple Choice

Place the Decimal point in the product
0.9 x 0.9

• 0.81
• 8.1
• 0.081
• 81

Multiple Choice

Which Equation matches the model? 

• .4 x .2 = 0.8
• 0.6 x 0.1 = 0.06
• 0.2 x 0.4 = 0.8
• 0.2 x 0.4 = 0.08

Multiple Choice

Which equation matches the model?

• 0.4 x 0.3 = 0.12
• 12 x 0.3 = 3.6
• 3 x 4 = 12
• 3 x .12 = 0.36

Multiple Choice

Which color represents the product for this model?

• blue
• white
• pink
• purple

Use the slide handout to color along

Multiple Choice

What is the equation for this model?

• 0.12 x 5 = 0.60

• 12 x 5 = 60

• 0.12 x 0.5 =0.06

• 0.5 x 12 = 6

Multiple Choice

1.6  x  ___ = 0.48

• 1.3
• 0.3
• 1.16
• 0.6

Multiple Choice

What equation is represented by the model?

• 1.5 x 0.5 = 0.75

• 1.5 x 0.5 = 7.5

• 1.5 x 1.5 = 0.75

Talk to your neighbors about patterns.

Open Ended

What patterns do you see in the equations?

This paper is in your workbook 191

Open Ended

TOTD: If you multiply two decimals less than 1, can you predict whether the product will be less than or greater than either of the factors? Provide an example problem to explain your answer.

Poll

How do confident do you feel about what we just learned?

• Super Confident

• Medium Confident

• Not Confident