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How can I estimate how tall the box should be?
I have a birthday present for my best friend- a gumball machine bank!
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In this lesson, you will learn what it means to estimate the
length of an object by comparing it to other objects.
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Let’s Review
How to compare parts of your body to standard units:
Thumb- inchArm- foot
Arm span- yard or meterPinky nail- centimeter
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Core Lesson
A close guess- not exactAn educated guess- based on information
Reasonable!
That baseball field is way too big to measure in
inches…
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A Common Misunderstanding
Thinking that your first estimate has to be right
I didn’t say, “3 feet,” I said, “3
inches!”
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Core Lesson
When do we estimate?How long?How much?How far?
How many?Really?
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Core Lesson Estimation is something we do in our heads
Hmm… bigger than an index card, but smaller
than a notebook…
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Core Lesson
About how long is the
clipboard?
Close to the length of my
forearm?
I’ll use a ruler to check in inches!
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Core Lesson
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In this lesson you have learned what it means to estimate the
length of an object by comparing it to other objects.