Number Line Adventures: Adding and Subtracting with Rob!

Math Grades 1st Grade 2:58 Video
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Lesson Description

Let's learn how to use number lines to add and subtract with Rob and his friends! We'll jump forward to add and backward to subtract.

Video Resource

Number Lines Song | Adding and Subtracting on a Number Line

Math Songs by NUMBEROCK

Duration: 2:58
Watch on YouTube

Key Concepts

  • Number lines
  • Addition as moving forward on a number line
  • Subtraction as moving backward on a number line
  • Intervals (equal spaces) on a number line

Learning Objectives

  • Students will be able to use a number line to solve addition problems.
  • Students will be able to use a number line to solve subtraction problems.
  • Students will be able to identify the starting point and the direction to move on a number line based on the given operation (addition or subtraction).

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they have ever used a number line before. Discuss what they know. Introduce the Numberock video 'Number Lines Song | Adding and Subtracting on a Number Line'. Tell them to pay attention to how Rob and his friends use the number line.
  • Video Viewing (5 mins)
    Play the Numberock video. Ensure all students can see and hear clearly. Pause at key points (e.g., when Rob adds or subtracts) to check for understanding.
  • Discussion (5 mins)
    After the video, discuss what they learned. Ask them what happens when you add on a number line? What happens when you subtract?
  • Practice with Addition (10 mins)
    Draw a large number line on the board (0-20). Give students simple addition problems (e.g., 5 + 3). Guide them to start at 5 and jump forward 3 spaces to find the answer. Repeat with different problems.
  • Practice with Subtraction (10 mins)
    Using the same number line, give students simple subtraction problems (e.g., 10 - 4). Guide them to start at 10 and jump backward 4 spaces to find the answer. Repeat with different problems.
  • Independent Practice (10 mins)
    Provide students with a worksheet with number lines and addition/subtraction problems to solve independently. Circulate to provide support as needed.

Interactive Exercises

  • Number Line Hop
    Create a large number line on the floor with tape. Call out addition or subtraction problems and have students physically hop along the number line to find the answer.
  • Drawing Number Lines
    Have students draw their own number lines and use them to solve problems. Encourage them to be creative and decorate their number lines.

Discussion Questions

  • What is a number line?
  • How does a number line help us add?
  • How does a number line help us subtract?
  • What does 'interval' mean on a number line?

Skills Developed

  • Addition
  • Subtraction
  • Problem-solving
  • Number sense
  • Visual representation

Multiple Choice Questions

Question 1:

What do you do on a number line when you add?

Correct Answer: Go forward

Question 2:

What do you do on a number line when you subtract?

Correct Answer: Go backward

Question 3:

If you start at 3 and go forward 2, where do you end up?

Correct Answer: 5

Question 4:

If you start at 8 and go backward 3, where do you end up?

Correct Answer: 5

Question 5:

What are the spaces between the numbers on a number line called?

Correct Answer: Intervals

Question 6:

What number do you start on to solve: 2 + 4?

Correct Answer: 2

Question 7:

Which way to you go on the number line when you are adding?

Correct Answer: Forward

Question 8:

Which way to you go on the number line when you are subtracting?

Correct Answer: Backward

Question 9:

Where do you start on the number line when you are trying to solve 5 - 2?

Correct Answer: 5

Question 10:

If you jump forward on a number line, are the numbers getting bigger or smaller?

Correct Answer: Bigger

Fill in the Blank Questions

Question 1:

When we add on a number line, we move ___________.

Correct Answer: forward

Question 2:

When we subtract on a number line, we move ___________.

Correct Answer: backward

Question 3:

The equal spaces on a number line are called ___________.

Correct Answer: intervals

Question 4:

To solve 4 + 2 on a number line, start at ___ and go forward 2.

Correct Answer: 4

Question 5:

To solve 9 - 3 on a number line, start at ___ and go backward 3.

Correct Answer: 9

Question 6:

The answer to 2 + 3 is _____ when using a number line.

Correct Answer: 5

Question 7:

If you go back one space from the number 6 on a number line, you are on number _____.

Correct Answer: 5

Question 8:

If you start at 0 and jump forward 4 spaces on a number line, you will land on number _____.

Correct Answer: 4

Question 9:

On a number line, the numbers get bigger as you move to the _________.

Correct Answer: right

Question 10:

On a number line, the numbers get smaller as you move to the _________.

Correct Answer: left

Educational Standards

CCSS.Math.Content.1.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). CCSS.Math.Content.1.MD.A.2:Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.

Teaching Materials

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