RCN Lesson 19: Solve Problems with Decimals

Last updated almost 3 years ago

17 questions

Required

RCN Lesson 19: Solve Problems with Decimals

Last updated almost 3 years ago

17 questions

Develop Understanding
Today's Learning Goal: (G5, U5, L10)
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

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

Round 45.8762 to the nearest tenth.

Required

Activity 1: How accurate is it? - ( 20 min) 

How would the results of the race change if the times were recorded to the nearest second?

Activity 2:Compare Speeds (15 min) 

Required

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?

Required

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

What are some reasons to round numbers?

Required

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

Nearest Tenth?

4.NF.7

Required

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? 

RCN Lesson 19: Solve Problems with Decimals

RCN Lesson 19: Solve Problems with Decimals

Jump Start: Notice and Wonder - (5 min)

What do you notice? What do you Wonder?

Round 45.8762 to the nearest tenth.

Activity 1: How accurate is it? - ( 20 min)

How would the results of the race change if the times were recorded to the nearest second?

Activity 2:Compare Speeds (15 min)

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?

Lesson Synthesis - (10 min)

What are some reasons to round numbers?

Cool Down: Luge Rider - (5 min)

Nearest Tenth?

Nearest hundreth?

Closure Questions:

Jump Start: Notice and Wonder - (5 min)

What do you notice? What do you Wonder?

Round 45.8762 to the nearest tenth.

Round 45.8762 to the nearest hundreth.

Round 45.8762 to the nearest thousandth.

Activity 1: How accurate is it? - ( 20 min)

How would the results of the race change if the times were recorded to the nearest second?

How would the results of the race change if the times were recorded to the nearest tenth of a second?

How would the results of the race change if the times were recorded to the nearest hundredth of a second?

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?

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)

List the top speeds of the athletes in decreasing order.

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?

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)

What are some reasons to round numbers?

What are some reasons to keep numbers unrounded?

How is rounding decimals the same as rounding whole numbers?

Cool Down: Luge Rider - (5 min)

Nearest Tenth?

Nearest hundreth?

Closure Questions:

Round 45.8762 to the nearest thousandth.

How would the results of the race change if the times were recorded to the nearest tenth of a second?

How would the results of the race change if the times were recorded to the nearest hundredth of a second?

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?

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?

List the top speeds of the athletes in decreasing order.

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?

What are some reasons to keep numbers unrounded?

How is rounding decimals the same as rounding whole numbers?