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Authoritative PPT Summary
"Millimeters and Kilometers" PPT
Part One: Introduction of New Course
1. What units of length have we learned?
2. Fill in the blanks with appropriate units.
A skipping rope is 2 ( ) long.
The length of a pencil is 18 ( ).
A DVD disc is approximately ( ) thick.
Do you want to know about millimeters?
Millimeters and Kilometers PPT, Part 2: Analysis of Examples
Example 1 Measure your own eraser.
My eraser is a little over 3cm long.
My eraser is less than 1cm thick.
The unit of length smaller than centimeters is millimeters, and millimeters are expressed in mm.
When measuring the length of a relatively short object or when a more precise measurement is required, millimeters can be used as the unit.
The length of each small grid in the middle of 1 cm is 1 mm.
Example 2 Group cooperation measurement.
(1) Measure the length, width and thickness of the mathematics textbook and record it.
Mathematics textbook length: __________
Mathematics textbook width: __________
Math textbook thickness: __________
(2) Measure the thickness of an exercise book.
The exercise book is too thin! How can we measure more accurately?
First measure the thickness of several exercise books, and then use the measurement results...
(3) Estimate how many sheets of paper there are in the stack.
First measure how thick the stack of paper is...
You can also measure out 1 mm first...
Millimeters and kilometers PPT, part 3: after-class exercises
fill in the blank
1 cm = ( ) mm 3 cm = ( ) mm
Choose an appropriate unit of length.
The pin is 3 ( ) long and the chalk is 75 ( ) long.
The paper clip is 28 ( ) long and the building is 20 ( ) high.
The pen is 14 ( ) long and the eraser is 35 ( ) long.
judge:
1. The water depth of children’s swimming pool is 7 mm. ( )
2. The desk is 60 meters high. ( )
3. A penny is about 1 mm thick. ( )
4. A pen is about 9 cm long. ( )
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