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Intro to the Number Line
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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?ANSWERThe number 2 is closer to 0 than to 5 since it is two units from 0 and three units from 5.
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.
I can make a ten: 41 + (1 + 19) = 41 + 20 = 61.
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.
The number 65 is halfway between 50 and 80.
After Video
Does a number line always start at 0?ANSWERNo, a number line can start and end at any number.
I start at the number 8 and make 7 single hops or jumps to the right and land on the number 15.
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.
The open number line can show different spacing. I can add very large numbers together on an open number line.
I can start at 212. I can start at 200 or 210.
- Vocabulary
- Number line DEFINE
A straight line with numbers placed in increasing order from left to right.
- Tick mark DEFINE
A mark on the number line. Each mark represents a number.
- Compare DEFINE
To determine which number in a set of numbers is greater or greatest.
- Addition DEFINE
To combine groups to find a new total.
- Subtraction DEFINE
To take away one number from another.
- Open number line DEFINE
A number line with no tick marks or end points.
- Skip counting DEFINE
Counting by more than 1s (for example, counting by 2s, 5s, 10s, or 100s).
- Number line DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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