Is the number 2 closer to the number 0 or closer to the number 5? How do you know?

The number 2 is closer to 0 than to 5 since it is two units from 0 and three units from 5.

Of the numbers 0, 4, 7, 16, and 20, which two are closest to each other? How can you tell?

The numbers 4 and 7 are closest to each other since they are three units apart while all the other numbers are more than three units apart.

What is one mental math strategy you can use to add 42 + 19?

I can make a ten: 41 + (1 + 19) = 41 + 20 = 61.

What is a strategy that you can use to find 15 meters less than 55 meters?

I can skip count back by 10 and again by 5. So I have 55 – 10 = 45 and 45 – 5 = 40. 55 – 15 is 40.

What number is halfway between 50 and 80?

The number 65 is halfway between 50 and 80.

Does a number line always start at 0?

No, a number line can start and end at any number.

Explain how to add 8 + 7 on a number line with equally-spaced tick marks one unit apart.

I start at the number 8 and make 7 single hops or jumps to the right and land on the number 15.

Explain how to subtract 290 – 155 on an open number line using skip counting by 100s, 10s, and 5s.

I start at 290 and skip count one hop left of 100 units to land on 190, then I make five hops left of 10 units and land on 140, and then I make one hop left of 5 units to land on 135. 290 – 155 = 135.

What is one difference between a labeled number line with equal spaces one unit apart and an open number line?

The open number line can show different spacing. I can add very large numbers together on an open number line.

What is one possible starting point on an open number line that you can use to add 212 + 57?

I can start at 212. I can start at 200 or 210.

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Intro to the Number Line

LESSON MATERIALS move

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What you will learn from this videoWhat you will learn

We will learn how a number line can help us compare numbers!
We'll also learn how to use a number line to add and subtract!
And we'll explore how this knowledge can help us take care of pets, compare snacks, and even count balloons.

Discussion Questions
- Before Video
  Is the number 2 closer to the number 0 or closer to the number 5? How do you know?ANSWER
  - The number 2 is closer to 0 than to 5 since it is two units from 0 and three units from 5.
  Of the numbers 0, 4, 7, 16, and 20, which two are closest to each other? How can you tell?ANSWER
  - The numbers 4 and 7 are closest to each other since they are three units apart while all the other numbers are more than three units apart.
  What is one mental math strategy you can use to add 42 + 19?ANSWER
  - I can make a ten: 41 + (1 + 19) = 41 + 20 = 61.
  What is a strategy that you can use to find 15 meters less than 55 meters? ANSWER
  - I can skip count back by 10 and again by 5. So I have 55 – 10 = 45 and 45 – 5 = 40. 55 – 15 is 40.
  What number is halfway between 50 and 80? ANSWER
  - The number 65 is halfway between 50 and 80.
- After Video
  Does a number line always start at 0?ANSWER
  - No, a number line can start and end at any number.
  Explain how to add 8 + 7 on a number line with equally-spaced tick marks one unit apart.ANSWER
  - I start at the number 8 and make 7 single hops or jumps to the right and land on the number 15.
  Explain how to subtract 290 – 155 on an open number line using skip counting by 100s, 10s, and 5s.ANSWER
  - I start at 290 and skip count one hop left of 100 units to land on 190, then I make five hops left of 10 units and land on 140, and then I make one hop left of 5 units to land on 135. 290 – 155 = 135.
  What is one difference between a labeled number line with equal spaces one unit apart and an open number line? ANSWER
  - The open number line can show different spacing. I can add very large numbers together on an open number line.
  What is one possible starting point on an open number line that you can use to add 212 + 57?ANSWER
  - I can start at 212. I can start at 200 or 210.
Vocabulary
- Number line DEFINE
- Tick mark DEFINE
- Compare DEFINE
- Addition DEFINE
- Subtraction DEFINE
- Open number line DEFINE
- Skip counting DEFINE

Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket

Intro to the Number Line

Discussion Questions

Vocabulary

Reading Material

Practice Word Problems

Practice Number Problems

Lesson Plan

Teacher Guide

Assessment