How can I estimate how tall the box should be?

I have a birthday present for my best friend- a gumball machine bank!

In this lesson, you will learn what it means to estimate the

length of an object by comparing it to other objects.

Let’s Review

How to compare parts of your body to standard units:

Thumb- inchArm- foot

Arm span- yard or meterPinky nail- centimeter

Core Lesson

A close guess- not exactAn educated guess- based on information

Reasonable!

That baseball field is way too big to measure in

inches…

A Common Misunderstanding

Thinking that your first estimate has to be right

I didn’t say, “3 feet,” I said, “3

inches!”

Core Lesson

When do we estimate?How long?How much?How far?

How many?Really?

Core Lesson Estimation is something we do in our heads

Hmm… bigger than an index card, but smaller

than a notebook…

Core Lesson

About how long is the

clipboard?

Close to the length of my

forearm?

I’ll use a ruler to check in inches!

Core Lesson

In this lesson you have learned what it means to estimate the

length of an object by comparing it to other objects.