Number Line Adventures: Adding and Subtracting!

Math Grades 1st Grade 1:56 Video
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Lesson Description

Learn how to use number lines to solve addition and subtraction problems with two-digit numbers! We'll jump forward for adding and jump backward for subtracting. Let's have fun exploring numbers!

Video Resource

Addition and subtraction with number lines | 2nd grade | Khan Academy

Khan Academy

Duration: 1:56
Watch on YouTube

Key Concepts

  • Number lines as a visual tool
  • Addition as moving to the right on a number line
  • Subtraction as moving to the left on a number line
  • Breaking down numbers into tens and ones for easier addition/subtraction

Learning Objectives

  • Students will be able to identify the correct number line representation for a given addition or subtraction problem.
  • Students will be able to use a number line to solve simple addition and subtraction problems involving two-digit numbers.
  • Students will be able to explain why a specific number line matches a given addition or subtraction problem.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about number lines. Review the concept of a number line as a way to visualize numbers and their relationships. Briefly discuss how moving to the right on a number line represents addition and moving to the left represents subtraction.
  • Video Viewing (7 mins)
    Show the Khan Academy video "Addition and subtraction with number lines | 2nd grade | Khan Academy". Encourage students to pay close attention to how Sal uses the number lines to solve the problems.
  • Guided Practice (10 mins)
    Work through a few examples on the board, similar to those in the video. Model how to break down two-digit numbers into tens and ones and how to represent those jumps on the number line. Involve students by asking them to help with the calculations and drawing the jumps.
  • Independent Practice (10 mins)
    Provide students with worksheets containing addition and subtraction problems and pre-drawn number lines. Have them solve the problems using the number lines, showing their jumps clearly. Circulate to provide support and answer questions.
  • Wrap-up and Discussion (3 mins)
    Review the main points of the lesson. Ask students to share their strategies for using number lines. Preview upcoming lessons on addition and subtraction.

Interactive Exercises

  • Number Line Hop
    Create a large number line on the floor using tape. Call out addition or subtraction problems and have students physically hop along the number line to find the answer. This kinesthetic activity will reinforce the concept of addition and subtraction as movement on the number line.
  • Matching Game
    Prepare cards with addition and subtraction problems and separate cards with corresponding number line representations. Have students match the problems to the correct number lines.

Discussion Questions

  • How does a number line help us understand adding and subtracting?
  • Why is it helpful to break numbers into tens and ones when using a number line?
  • Can you think of other ways we can use number lines in math?

Skills Developed

  • Addition and Subtraction
  • Number Sense
  • Problem Solving
  • Visual Representation

Multiple Choice Questions

Question 1:

What do we do on the number line when we ADD?

Correct Answer: Jump to the RIGHT

Question 2:

What do we do on the number line when we SUBTRACT?

Correct Answer: Jump to the LEFT

Question 3:

If you start at 10 and jump 5 to the right, where do you land?

Correct Answer: 15

Question 4:

Which number line shows 5 + 3?

Correct Answer: Starts at 5 and jumps 3 right

Question 5:

Which number line shows 8 - 2?

Correct Answer: Starts at 8 and jumps 2 left

Question 6:

What is 20 + 10 using a number line?

Correct Answer: 30

Question 7:

What is 15 - 5 using a number line?

Correct Answer: 10

Question 8:

If a jump takes you to a BIGGER number, is it adding or subtracting?

Correct Answer: Adding

Question 9:

If a jump takes you to a SMALLER number, is it adding or subtracting?

Correct Answer: Subtracting

Question 10:

You start at 50 and jump 10 to the left. Where do you end up?

Correct Answer: 40

Fill in the Blank Questions

Question 1:

A number line is like a road for ___________.

Correct Answer: numbers

Question 2:

When we add on a number line, we jump to the __________.

Correct Answer: right

Question 3:

When we subtract on a number line, we jump to the __________.

Correct Answer: left

Question 4:

Starting at 7 and jumping 2 to the right lands you on _________.

Correct Answer: 9

Question 5:

Starting at 12 and jumping 3 to the left lands you on _________.

Correct Answer: 9

Question 6:

4 + 6 = ______. You can use a number line to help!

Correct Answer: 10

Question 7:

10 - 3 = ______. You can use a number line to help!

Correct Answer: 7

Question 8:

Jumping on a number line helps us ___________ and ____________.

Correct Answer: add

Question 9:

Jumping on a number line helps us ___________ and ____________.

Correct Answer: subtract

Question 10:

If you start at a small number and jump right, the number gets ___________.

Correct Answer: bigger

Educational Standards

1.NBT.C.4:Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. 1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). 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.

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