Subtraction Superstars: Mastering Number Lines!

Math Grades 1st Grade 7:13 Video
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Lesson Description

Learn how to use number lines to become subtraction superstars! This lesson uses a fun video to teach you how to jump back on the number line to find the answer when you subtract.

Video Resource

Learn Grade 1 - Maths - Subtraction Using Number line

KidsClassroom - Nursery Rhymes & Kids Songs

Duration: 7:13
Watch on YouTube

Key Concepts

  • Subtraction as 'taking away'
  • Using a number line as a visual tool
  • Moving left on the number line when subtracting

Learning Objectives

  • Students will be able to identify the starting number on a number line for subtraction.
  • Students will be able to correctly move the specified number of spaces to the left on a number line to subtract.
  • Students will be able to solve simple subtraction problems (within 10) using a number line.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about subtraction. What does it mean to subtract? Use simple examples like taking away crayons or sharing cookies to illustrate the concept. Introduce the idea of a number line as a tool to help with subtraction.
  • Video Viewing (5 mins)
    Play the YouTube video: Learn Grade 1 - Maths - Subtraction Using Number line. Encourage students to pay close attention to how the number line is used to solve subtraction problems. Pause the video at key points to ask clarifying questions.
  • Guided Practice (10 mins)
    After the video, draw a number line on the board (0-10). Work through several subtraction problems together as a class, modeling how to start at the first number and 'jump' to the left to subtract. Emphasize counting the jumps carefully. Use examples from the video like 5-2 and 6-4.
  • Independent Practice (10 mins)
    Give each student a worksheet with pre-drawn number lines and subtraction problems (e.g., 4-1, 7-3, 9-2). Have them solve the problems independently using the number lines. Circulate to provide assistance and support.
  • Wrap Up (5 mins)
    Review the answers to the independent practice problems. Ask students to explain in their own words how to use a number line to subtract. Reiterate that subtracting means moving to the left on the number line.

Interactive Exercises

  • Number Line Hop
    Draw a large number line on the floor with tape. Call out subtraction problems and have students physically 'hop' along the number line to find the answer.
  • Bead Subtraction
    Provide students with beads and string. Have them create their own number lines and use the beads to represent the subtraction problems.

Discussion Questions

  • What happens when you subtract? Do you get a bigger or smaller number?
  • When you use a number line for subtraction, which way do you move?

Skills Developed

  • Subtraction skills
  • Number line comprehension
  • Problem-solving

Multiple Choice Questions

Question 1:

What does it mean to subtract?

Correct Answer: To take away

Question 2:

If you are subtracting using a number line, which way do you move?

Correct Answer: To the left

Question 3:

What number do you start on when you subtract 5 - 3 on the number line?

Correct Answer: 5

Question 4:

If you start at 7 on the number line and move 2 spaces to the left, what number do you land on?

Correct Answer: 5

Question 5:

What is 6 - 2?

Correct Answer: 4

Question 6:

What is 4 - 1?

Correct Answer: 3

Question 7:

What is 8 - 3?

Correct Answer: 5

Question 8:

If you are using a number line to subtract, are you making the number bigger or smaller?

Correct Answer: Smaller

Question 9:

What is 5 - 1?

Correct Answer: 4

Question 10:

What is 9 - 2?

Correct Answer: 7

Fill in the Blank Questions

Question 1:

To subtract means to ______ away.

Correct Answer: take

Question 2:

A number line is a helpful ______ for subtraction.

Correct Answer: tool

Question 3:

When you subtract, you move to the ______ on the number line.

Correct Answer: left

Question 4:

In the problem 7 - 3, you start at the number ______ on the number line.

Correct Answer: 7

Question 5:

5 - 2 = ______

Correct Answer: 3

Question 6:

6 - 4 = ______

Correct Answer: 2

Question 7:

4 - 1 = ______

Correct Answer: 3

Question 8:

When we subtract, the answer gets ______.

Correct Answer: smaller

Question 9:

8 - 5 = _______

Correct Answer: 3

Question 10:

A number line has ________ on both sides.

Correct Answer: arrows

Educational Standards

CCSS.Math.Content.1.OA.C.6:Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). 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).

Teaching Materials

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