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Intro to the Number Line
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 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 VideoIs 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.
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 VideoDoes a number line always start at 0?ANSWER
No, 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