Adding and Subtracting Fun: Let's Solve Math Problems!

Math Grades 1st Grade 2:14 Video
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Lesson Description

Learn how to add and subtract numbers up to 10 with fun problems and examples!

Video Resource

Addition and subtraction within 10 | Basic addition and subtraction | Early Math | Khan Academy

Khan Academy

Duration: 2:14
Watch on YouTube

Key Concepts

  • Addition: Combining two or more groups to find the total.
  • Subtraction: Taking away a number from a group to find the difference.
  • Equal Sign: Understanding that the equal sign (=) means 'is the same as'.

Learning Objectives

  • Students will be able to solve addition problems within 10.
  • Students will be able to solve subtraction problems within 10.
  • Students will be able to determine the missing number in addition and subtraction equations within 10.

Educator Instructions

  • Introduction (5 mins)
    Start by asking students what they already know about adding and subtracting. Use simple examples like counting fingers and toes. Introduce the terms 'addition,' 'subtraction,' and 'equal sign'.
  • Watch the Video (7 mins)
    Play the Khan Academy video: 'Addition and subtraction within 10 | Basic addition and subtraction | Early Math | Khan Academy'. Encourage students to follow along and try to solve the problems as the video presents them.
  • Practice Problems (10 mins)
    Work through additional addition and subtraction problems on the board. Start with problems similar to those in the video. Gradually increase the difficulty. Encourage students to explain their thinking process.
  • Missing Number Game (8 mins)
    Write equations with missing numbers on the board (e.g., 3 + _ = 5, 7 - _ = 2). Have students come up and fill in the blanks. Make it a fun and engaging activity.

Interactive Exercises

  • Counting Blocks
    Use counting blocks to visually represent addition and subtraction problems. For example, to solve 2 + 3, have students put 2 blocks and then 3 blocks together and count the total.
  • Number Line Jumps
    Use a number line to demonstrate addition and subtraction. For addition, jump forward. For subtraction, jump backward.

Discussion Questions

  • What happens when we add two numbers together?
  • What happens when we subtract one number from another?
  • Why is it important to know how to add and subtract?

Skills Developed

  • Addition and Subtraction Fluency
  • Problem-Solving
  • Critical Thinking

Multiple Choice Questions

Question 1:

What is 2 + 3?

Correct Answer: 5

Question 2:

What is 5 - 1?

Correct Answer: 6

Question 3:

What number is the same as 1 + 1?

Correct Answer: 2

Question 4:

What is 4 + 0?

Correct Answer: 4

Question 5:

What is 6 - 2?

Correct Answer: 4

Question 6:

Which of these is equal to 7?

Correct Answer: 5 + 2

Question 7:

If you have 8 cookies and eat 3, how many are left?

Correct Answer: 5

Question 8:

What is 9 - 9?

Correct Answer: 0

Question 9:

What is 2 + 2 + 2?

Correct Answer: 6

Question 10:

What is bigger: 5 or 3?

Correct Answer: 5

Fill in the Blank Questions

Question 1:

3 + 1 = ______

Correct Answer: 4

Question 2:

6 - 3 = ______

Correct Answer: 3

Question 3:

2 + ______ = 4

Correct Answer: 2

Question 4:

5 - ______ = 2

Correct Answer: 3

Question 5:

1 + 5 = ______

Correct Answer: 6

Question 6:

8 - 4 = ______

Correct Answer: 4

Question 7:

______ + 2 = 5

Correct Answer: 3

Question 8:

7 - ______ = 1

Correct Answer: 6

Question 9:

4 + 4 = ______

Correct Answer: 8

Question 10:

10 - ______ = 5

Correct Answer: 5

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.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 = _. 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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