Adding Up & Taking Away: Discovering the Connection!

Math Grades 1st Grade 11:35 Video
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Lesson Description

Explore the relationship between addition and subtraction using fun building blocks! Learn how they are connected and how one can help you understand the other.

Video Resource

Learn Grade 1 - Maths - Relation Between Addition and Subtraction

KidsClassroom - Nursery Rhymes & Kids Songs

Duration: 11:35
Watch on YouTube

Key Concepts

  • Addition as combining groups
  • Subtraction as taking away from a group
  • The inverse relationship between addition and subtraction
  • Commutative property of addition (changing the order of addends doesn't change the sum)

Learning Objectives

  • Students will be able to define addition as combining and subtraction as taking away.
  • Students will be able to explain the relationship between addition and subtraction.
  • Students will be able to solve simple addition and subtraction problems within 10.
  • Students will be able to demonstrate the commutative property of addition.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they already know about addition and subtraction. Show the YouTube video 'Learn Grade 1 - Maths - Relation Between Addition and Subtraction'. Tell them to pay close attention to how addition and subtraction are related.
  • Discussion (10 mins)
    After the video, review the key concepts. Ask students to explain in their own words what addition and subtraction mean. Discuss the examples used in the video with the blocks.
  • Activity 1: Building Block Equations (15 mins)
    Provide students with building blocks (or other manipulatives). Have them work in pairs to create addition and subtraction equations. For example: Give students 5 blocks. Ask them to split the blocks into two groups (e.g. 2 and 3). They then create the equations: 2 + 3 = 5 and 5 - 2 = 3, 5 - 3 = 2. Have students draw their equations on paper. Have them present their findings to the class.
  • Activity 2: Worksheet Practice (10 mins)
    Distribute a worksheet with simple addition and subtraction problems, including fill-in-the-blank questions to reinforce the relationship between the two operations (similar to the activity in the video). Examples: 3 + ___ = 7; 7 - 3 = ___

Interactive Exercises

  • Number Bond Fun
    Draw number bonds on the board. Fill in two of the circles and have students fill in the missing number using both addition and subtraction. Example: A circle with '4', a circle with '2', and a circle with a blank. Students fill in '6' and then write the equations 4 + 2 = 6 and 6 - 4 = 2.
  • Act it Out
    Use students themselves as 'objects' to demonstrate addition and subtraction. For example: Have 3 students stand at the front of the room. Then have 2 more students join them. Ask 'How many students are there now?' (Addition). Then, have 1 student sit down. Ask 'How many students are standing now?' (Subtraction).

Discussion Questions

  • What happens when we add things together?
  • What happens when we take things away?
  • Can you think of a time you used addition or subtraction today?
  • How are adding and taking away related? Can one help you with the other?
  • If you know 2 + 3 = 5, what subtraction problems do you also know?

Skills Developed

  • Addition and subtraction skills
  • Problem-solving skills
  • Understanding mathematical relationships
  • Critical thinking

Multiple Choice Questions

Question 1:

What does it mean to ADD?

Correct Answer: To put together

Question 2:

What does it mean to SUBTRACT?

Correct Answer: To take away

Question 3:

If you have 2 apples and you get 3 more, how many apples do you have?

Correct Answer: 5

Question 4:

If you have 5 cookies and you eat 2, how many cookies are left?

Correct Answer: 3

Question 5:

Which number sentence shows adding?

Correct Answer: 2 + 2 = 4

Question 6:

Which number sentence shows taking away?

Correct Answer: 6 - 2 = 4

Question 7:

If 3 + 2 = 5, then 5 - 2 = ?

Correct Answer: 3

Question 8:

If you know 4 + 1 = 5, what is another way to write the same problem?

Correct Answer: 1 + 4 = 5

Question 9:

What is 5 + 0?

Correct Answer: 5

Question 10:

What is 7 - 0?

Correct Answer: 7

Fill in the Blank Questions

Question 1:

Adding means to ______ things together.

Correct Answer: put

Question 2:

Taking away means to ______ things.

Correct Answer: subtract

Question 3:

4 + 2 = ____

Correct Answer: 6

Question 4:

7 - 3 = ____

Correct Answer: 4

Question 5:

If 2 + 1 = 3, then 3 - 1 = ____

Correct Answer: 2

Question 6:

If 5 - 2 = 3, then 3 + 2 = ____

Correct Answer: 5

Question 7:

3 + ____ = 5

Correct Answer: 2

Question 8:

6 - ____ = 4

Correct Answer: 2

Question 9:

5 + 3 = ____

Correct Answer: 8

Question 10:

8 - 3 = ____

Correct Answer: 5

Educational Standards

CCSS.Math.Content.1.OA.B.4:Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8. 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.D.8:Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.

Teaching Materials

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