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### Transcript

• 1. 2.1
Measuring Lengths
• 2. Customary Units
Copy this in your spiral notebook
Inch – length of a small paper clip
Foot – distance from elbow to knuckle (12 inches)
Yard – width of a door (3 feet)
• 3. Metric Units
Copy this in your spiral notebook
Millimeter –width of a ship won (gold ship wons or penny)
Centimeter – width of your little finger
Meter height of a chair
• 4. Activity – Do This
Measure how long your book is in paperclips.
height 
width
Math Text Book
• 6. Activity – Do This
• 7. EXAMPLE 1
Using Customary Units of Length
• 8. EXAMPLE 1
Using Customary Units of Length
Find the length of the caterpillar to the nearest inch
• 9. EXAMPLE 1
EXAMPLE 1
Using Customary Units of Length
Using Customary Units of Length
Find the length of the caterpillar to the nearest inch
• 10. EXAMPLE 1
Using Customary Units of Length
Find the length of the caterpillar to the nearest inch
• 11. EXAMPLE 1
Using Customary Units of Length
Find the length of the caterpillar to the nearest inch
The caterpillar is about 2 inches long.
• 12. EXAMPLE 2
Using Metric Units of Length
• 13. EXAMPLE 2
Using Metric Units of Length
Find the length of the seashell to the nearest millimeter.
• 14. EXAMPLE 2
Using Metric Units of Length
Find the length of the seashell to the nearest millimeter.
• 15. EXAMPLE 2
Using Metric Units of Length
Find the length of the seashell to the nearest millimeter.
• 16. EXAMPLE 2
Using Metric Units of Length
Find the length of the seashell to the nearest millimeter.
The seashell is about 45millimeters long.
• 17. EXAMPLE 3
Choosing Appropriate Tools
• 18. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
• 19. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
a. width of a calculator
• 20. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
a. width of a calculator
b. length of a bus
• 21. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
a. width of a calculator
b. length of a bus
SOLUTION
• 22. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
a. width of a calculator
b. length of a bus
SOLUTION
The width of a calculator is less than one foot and less than 30 centimeters.So, you should use a foot ruler or a centimeter ruler to measure the length.
a.
• 23. EXAMPLE 3
Choosing Appropriate Tools
Choose an appropriate measuring tool for the length. Explain your reasoning.
a. width of a calculator
b. length of a bus
SOLUTION
The width of a calculator is less than one foot and less than 30 centimeters.So, you should use a foot ruler or a centimeter ruler to measure the length.
a.
The length of a bus is greater than one yard and greater than one meter.So, you should use a tape measure to measure the length.
b.
• 24. EXAMPLE 4
Choosing Appropriate Units
• 25. EXAMPLE 4
Choosing Appropriate Units
Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.
• 26. EXAMPLE 4
Choosing Appropriate Units
Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.
distance from Boston to Chicago
• 27. EXAMPLE 4
Choosing Appropriate Units
Choose an appropriate customary unit and metric unit for the length. Explain your reasoning.
distance from Boston to Chicago
height of a full grown tree
• 28. EXAMPLE 4
Choosing Appropriate Units
SOLUTION
The distance from Boston to Chicago is much greater than one yard and much greater than one meter. So, use miles or kilometers.
a.
• 29. The height of a tree is much greater than either one inch or one centimeter. The height is also much less than either one mile or one kilometer. So, use feet, yards, or meters.
b.
EXAMPLE 4
Choosing Appropriate Units
SOLUTION
The distance from Boston to Chicago is much greater than one yard and much greater than one meter. So, use miles or kilometers.
a.
• 30. EXAMPLE 5
Estimating Length Using Benchmarks
• 31. EXAMPLE 5
Estimating Length Using Benchmarks
Estimate the height, in meters, of the door below. Measure to check.
• 32. EXAMPLE 5
Estimating Length Using Benchmarks
Estimate the height, in meters, of the door below. Measure to check.
STEP 1 To estimate, imagine how high the door is in “chairs.”
• 33. EXAMPLE 5
Estimating Length Using Benchmarks
Estimate the height, in meters, of the door below. Measure to check.
STEP 1 To estimate, imagine how high the door is in “chairs.”
STEP 2 To check your estimate, measure the door with a meterstick.
• 34. EXAMPLE 5
Estimating Length Using Benchmarks
Estimate the height, in meters, of the door below. Measure to check.
STEP 1 To estimate, imagine how high the door is in “chairs.”
STEP 2 To check your estimate, measure the door with a meterstick.
• 35. EXAMPLE 5
Estimating Length Using Benchmarks
Estimate the height, in meters, of the door below. Measure to check.
STEP 1 To estimate, imagine how high the door is in “chairs.”
STEP 2 To check your estimate, measure the door with a meterstick.