Adding Fun: Let's Add Three Numbers Together!

Math Grades 1st Grade 2:37 Video
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Lesson Description

Learn how to add three numbers together, just like counting shapes! We'll use fun ways to find the total.

Video Resource

Adding 5 + 3 + 6 | Addition and subtraction within 20 | Early Math | Khan Academy

Khan Academy

Duration: 2:37
Watch on YouTube

Key Concepts

  • Adding three numbers
  • Finding the total
  • Order of addition doesn't change the sum

Learning Objectives

  • Students will be able to add three numbers together to find the total.
  • Students will understand that changing the order of the numbers being added does not change the final sum.
  • Students will develop strategies for memorizing simple sums.

Educator Instructions

  • Introduction (5 mins)
    Start by asking students what they already know about adding numbers. Show them the video and tell them they will learn how to add three numbers together.
  • Watching the Video (7 mins)
    Play the Khan Academy video 'Adding 5 + 3 + 6'. Encourage students to pay attention to how the numbers are added and the concept of shapes representing the numbers.
  • Practice Together (10 mins)
    Do some example problems on the board together, like 2 + 4 + 1 or 3 + 5 + 2. Have students come up and write the answers. Use fingers, drawings, or small objects to help them.
  • Independent Practice (10 mins)
    Give each student a worksheet with problems like: 1 + 2 + 3 = ?, 4 + 1 + 1 = ?, 2 + 2 + 2 = ?, 5 + 0 + 1 = ?, 3 + 2 + 4 = ?. Have them solve the problems on their own.
  • Wrap Up (3 mins)
    Review the main points of the lesson: adding three numbers to find the total, and that it doesn't matter which numbers you add first. Remind them to practice their number facts!

Interactive Exercises

  • Shape Addition
    Draw different shapes (stars, circles, squares) on the board. Assign each shape a number. Have students add the shapes together based on their number values.
  • Number Line Game
    Use a number line to show how to add three numbers. Start at the first number, jump to add the second, then jump again to add the third. Where do you land?

Discussion Questions

  • What happens when we add numbers in a different order?
  • Can you think of a real-life situation where you might need to add three numbers together?

Skills Developed

  • Addition skills
  • Problem-solving skills
  • Number sense

Multiple Choice Questions

Question 1:

What is 2 + 1 + 3?

Correct Answer: 6

Question 2:

What is 1 + 4 + 2?

Correct Answer: 7

Question 3:

What is 3 + 0 + 2?

Correct Answer: 5

Question 4:

What is 2 + 2 + 2?

Correct Answer: 6

Question 5:

What is 1 + 1 + 1?

Correct Answer: 3

Question 6:

What is 4 + 1 + 0?

Correct Answer: 5

Question 7:

What is 0 + 3 + 3?

Correct Answer: 6

Question 8:

What is 2 + 3 + 1?

Correct Answer: 6

Question 9:

What is 1 + 5 + 0?

Correct Answer: 6

Question 10:

What is 3 + 2 + 2?

Correct Answer: 7

Fill in the Blank Questions

Question 1:

1 + 2 + 4 = ____

Correct Answer: 7

Question 2:

2 + 3 + 0 = ____

Correct Answer: 5

Question 3:

1 + 1 + 3 = ____

Correct Answer: 5

Question 4:

0 + 4 + 2 = ____

Correct Answer: 6

Question 5:

2 + 1 + 1 = ____

Correct Answer: 4

Question 6:

3 + 3 + 1 = ____

Correct Answer: 7

Question 7:

4 + 0 + 0 = ____

Correct Answer: 4

Question 8:

1 + 2 + 2 = ____

Correct Answer: 5

Question 9:

2 + 2 + 3 = ____

Correct Answer: 7

Question 10:

0 + 5 + 1 = ____

Correct Answer: 6

Educational Standards

CCSS.Math.Content.1.OA.A.2:Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.OA.B.3:Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) 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).

Teaching Materials

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