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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!
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.