SESSION 1 Explore Estimating and Measuring Length

LESSON 23

SESSION 1

Explore Estimating and Measuring Length

Previously, you used different units to measure

length. Use what you know to try to solve the

problem below.

Learning Target

??Estimate lengths using units of inches,

feet, centimeters, and meters.

SMP 1, 2, 3, 4, 5, 6

A quarter is about 1 inch across,

so it is a good estimate for 1 inch.

Ty wants to estimate the length

of his toy car. What is a good

estimate for its length in inches?

TRY IT

Math Toolkit

? play quarters

DISCUSS IT

Ask your partner:

How did you get

started?

Tell your partner:

At first, I thought . . .

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Lesson 23 Estimate and Measure Length

551

LESSON 23

SESSION 1

EXPLORE

Connect It

1 LOOK BACK

What is a good estimate for the length of Ty¡¯s car?

inches

2 LOOK AHEAD

You can use other objects to help you estimate lengths.

1 centimeter

1 inch

your little finger

a quarter is

is about

1 centimeter about 1 inch

across

across

1 foot

1 meter

about the

length of a

loaf of bread

a door is

about 1 meter

across

Julia knows a marker is about 14 centimeters long.

Is the length of the pencil case more or less than

14 centimeters? Explain how you know.

3 REFLECT

Hannah estimates that Julia¡¯s pencil case is

28 centimeters long. Is this a good estimate? Explain.

552

Lesson 23 Estimate and Measure Length

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Name:

LESSON 23

SESSION 1

Prepare for Estimating and Measuring Length

1 Think about what you know about estimating. Fill

in each box. Use words, numbers, and pictures. Show

as many ideas as you can.

In My Own Words

Examples

My Illustrations

estimate

Non-Examples

2 Balin knows the stapler is about 15 centimeters

long. Is the length of the glasses more or less than

15 centimeters? Explain.

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Lesson 23 Estimate and Measure Length

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LESSON 23

SESSION 1

3 Solve the problem. Show your work.

Since a quarter is about 1 inch across,

it is a good estimate for 1 inch.

Gena wants to estimate the length

of the toy boat. What is a good

estimate for its length in inches?

Solution

4 Check your answer. Show your work.

554

Lesson 23 Estimate and Measure Length

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LESSON 23

SESSION 2

Develop Using Different Units to Estimate Length

Read and try to solve the problem below.

1 centimeter is a good estimate for

the distance across your little finger.

What is a good estimate for the length

of this stamp?

TRY IT

Math Toolkit

? play quarters

? centimeter cubes

DISCUSS IT

Ask your partner:

Why did you choose

that strategy?

Tell your partner:

I¡¯m not sure how to

find the answer

because . . .

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Lesson 23 Estimate and Measure Length

555

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