Round decimals to different place values and order them.
Today's Materials:
Laptop
Laptop charger
Pen/Pencil/Paper (optional)
Please complete the Jump Start (activator). You have 5 minutes before we review. This is independent it should be silent.
Reminders:
1. Ready for class
2. No cellphones
3. Volume must be low.
4. Read and follow all directions
5.) Take your bag off and immediately begin the Activator.
Jump Start: Notice and Wonder - (5 min)
Required
1 point
1
Question 1
1.
What do you notice? What do you Wonder?
Launch: Rounding Decimals to Different Place Values - (10 min)
I'll Model ( Question 2 )
We'll Do (Question 3 )
You Try (Question 4 )
Recall Rounding Rules.
Required
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Question 2
2.
Round 45.8762 to the nearest tenth.
Required
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Question 3
3.
Round 45.8762 to the nearest hundreth.
Required
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Question 4
4.
Round 45.8762 to the nearest thousandth.
Activity 1: How accurate is it? - ( 20 min)
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Question 5
5.
How would the results of the race change if the times were recorded to the nearest second?
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Question 6
6.
How would the results of the race change if the times were recorded to the nearest tenth of a second?
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Question 7
7.
How would the results of the race change if the times were recorded to the nearest hundredth of a second?
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Question 8
8.
An athlete recorded a time of 48.85 seconds to the nearest hundredth of a second. What are the possible times of this athlete recorded to the thousandth of a second?
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Question 9
9.
An athlete recorded a time of 48.615 seconds to the nearest thousandth of a second. What are the possible times that this athlete recorded to the nearest hundredth of a second?
Activity 2:Compare Speeds (15 min)
Required
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Question 10
10.
List the top speeds of the athletes in decreasing order.
82.81
82.75
82.80
83.07
82.13
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Question 11
11.
Do any of the athletes have the same top speed rounded to the nearest tenth of a mile per hour? What about rounded to the nearest mile per hour?
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Question 12
12.
There was a sixth athlete who was faster than the rider at 82.80 mph, but slower than the rider at 82.81 mph. What could the speeds of the 3 athletes be if all measured to the nearest thousandth of a mile per hour?
Lesson Synthesis - (10 min)
Today we studied numbers that represented times and top speeds of luge riders and how they are affected when rounded to different places.
Required
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Question 13
13.
What are some reasons to round numbers?
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Question 14
14.
What are some reasons to keep numbers unrounded?
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Question 15
15.
How is rounding decimals the same as rounding whole numbers?
Cool Down: Luge Rider - (5 min)
A luge rider finished a race in 49.256 seconds. Determine the time rounded to the nearest tenth and hundredth of a second.
Required
4 points
4
Question 16
16.
Nearest Tenth?
Required
4 points
4
Question 17
17.
Nearest hundreth?
Closure Questions:
What is the place value of the digit 5 from the number 123.45?
What is the place value of the digit 4 from the number 123.45?
23/100 as a decimal is what?
2.3 as a fraction is what?
Where is the decimal point located for a whole number?
