4.1.1 Estimating and Finding Products

​Estimating and Finding Products

4.1.1 Guided Lesson

People collect different things!

Examples include: Coins, buttons, stamps, trading cards, and plushies!

​Better Homes and Gardens

​WikiHow

Open Ended

Is there anything that you collect?

Match

Match the expression to its value. Think about what strategies you used!

• 50 x 6

• 50 x 60

• 50 x 600

• 600 x 500

300

3,000

30,000

300,000

• 300

• 3,000

• 30,000

• 300,000

Poll

Oliver collects coins in a jar. He is hoping to fill it all the way!

How many coins do you estimate are in Oliver's jar so far?

• less than 100

• between 100 and 200

• between 200 and 300

• more than 300

Estimating Products

​What is a benchmark number for 18?

​What is a benchmark number for 96?

Draw

Find the estimated value of 18 x 9.

​Organizing by Place Value

​Observe the expression 18 x 49

We can use an area model to find the product.

​

​18

​49

​

​We can separate the place values of 18 and 49!

​Organizing by Place Value

Expand the place values of 10 and 49.

​

​10

​40 9

​Then, add those amounts together.

Multiply 40 x 10

Multiply 9 x 10

​Organizing by Place Value

​

20

​What is the product of 20 x 37?

​Then, add those amounts together.

​Expand 37 by place value

​Organizing by Place Value

​

​30

​What is the product of 30 x 53?

​Then, add those amounts together.

​Expand 53 by place value

​Organizing by Place Value

​

​40

​What is the product of 40 x 142?

​Then, add those amounts together.

​Expand 142 by place value

​Organizing by Place Value

​

​40

​What is the product of 40 x 212?

​Then, add those amounts together.

​Expand 212 by place value