MODULE 2Measuring using centimeter rulers and meter sticks

and making estimations

Fluency PracticeRelated Facts on a Ruler

Find 3 on the ruler you made yesterday.Raise your hand when you know 8 more than 3.

Ready?11!

Give me a number sentence starting with 3 thatshows 8 more.

3+8=11

Put your finger on 11. Raise your hand when youknow 3 less than 11. 11-

3=8

8!What is the number sentence?

Give a number sentence to show 8 less than 1111-8=3

Fluency PracticeFind 2 on the ruler you made yesterday.Raise your hand when you know 9 more than 2.

Ready?11!

Give me a number sentence starting with 2 thatshows 9 more.

2+9=11

Put your finger on 11. Raise your hand when youknow 2 less than 11. 11-

2=9

9!What is the number sentence?

Give a number sentence to show 8 less than 1111-9=2

Fluency PracticeFind 4 on the ruler you made yesterday.Raise your hand when you know 9 more than 4.

Ready?13!

Give me a number sentence starting with 4 thatshows 9 more.

4+9=13

Put your finger on 13. Raise your hand when youknow 4 less than 13. 13-

4=9

9!What is the number sentence?

Give a number sentence to show 4 less than 1313-9=4

Fluency PracticeFind 6 on the ruler you made yesterday.Raise your hand when you know 9 more than 6.

Ready?15!

Give me a number sentence starting with 6 thatshows 9 more.

6+9=15

Put your finger on 15. Raise your hand when youknow 6 less than 15. 15-

6=9

9!What is the number sentence?

Give a number sentence to show 9 less than 1515-9=6

Application ProblemEthan has 8 fewer cards than Tristan. Tristan has 50 playing

cards. How many playing cards does Ethan have?

T

E

50T

E ?

8

50-8=

Ethan has 42playing cards.

50-8=40 10

10-8=240+2=42

Ethan has 42 playing cards.

Concept DevelopmentPut your pinky on a centimeter space. Would you say it’s about

the same width as the centimeter cube?

How could you use your pinky to estimate length?

Let’s try using our pinkies to measure the lid of your marker.Turn to your neighbor and share your estimate

Lets check to see how close we were with our centimeter rulers

Concept DevelopmentMeasure your finger using your ruler. About how many centimeters

long is your finger?

Lets try using our finger to measure how long our book box is.Turn to your neighbor and compare your estimates.

Lets check to see how close we were with our centimeter rulers

Concept DevelopmentLets pretend we were building this school. I want to measure the

floor to see how long our carpet should be.Can someone bring a ruler up from yesterday to measure the carpet?

This ruler isn’t very big. It could take us a long time to measurethe entire length of the floor.

Maybe we can use this tool instead!

How many centimeter rulers can we fit on this tool?

about 5 centimeter rulers!

We can say this tool is about 5 centimeter rulers long.

Concept DevelopmentThis tool is called a meter stick. It is 100 centimeters long

We use a meter stick the same way we use a ruler.

When we are measuring things that are more than 100 centimeters, we can measure in meters.

Lets measure that floor now.

I also have this tool.

What could I measure using this tool that I couldn’t measure with the meter stick?

Anything round or curved!

Concept DevelopmentIf I want to measure the door, should I use a centimeter ruler or the meter stick?

The hight of your desk? Make an estimation.

The length of the room? Make an estimation.

The length of the bookcase? Make an estimation.

Your height? Make an estimation.

My height? Make an estimation.

The length of the whiteboard? Make an estimation.

The hight of your book box? Make an estimation.

Problem Set

Problem Set

Problem Set

Problem Set

Student Debrief- Which things did you measure in centimeters? Why? Which things did you measure in meters? Why?- Did you or your partner disagree on any of the measurement tools you selected? Defend your choice.- How do the size and shape of what we measure tell us which tool is most appropriate?

- What new vocabulary did we earn today?- How many mental benchmarks can you name?- How do mental benchmarks help us? When is a good time to use them?