Adding and Subtracting Fun: Mastering Math Facts within 20!

Math Grades 1st Grade 3:08 Video
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Lesson Description

Let's learn how to add and subtract numbers up to 20! This lesson will help you solve problems where you add things together, take things away, and figure out how many are left.

Video Resource

Addition and Subtraction within 20 - 1st Grade Math (1.OA.1)

Boddle Learning

Duration: 3:08
Watch on YouTube

Key Concepts

  • Addition (adding to, putting together)
  • Subtraction (taking from, taking apart)
  • Solving for unknown numbers

Learning Objectives

  • Students will be able to solve addition and subtraction problems within 20.
  • Students will be able to identify situations that require addition or subtraction.
  • Students will be able to find the missing number in an equation.

Educator Instructions

  • Introduction (5 mins)
    Start by asking students what they already know about addition and subtraction. Ask them to share examples of when they use addition or subtraction in their everyday lives (e.g., sharing toys, eating snacks).
  • Video Viewing (5 mins)
    Watch the Boddle Learning video 'Addition and Subtraction within 20 - 1st Grade Math (1.OA.1)'. Encourage students to pay attention to the different ways addition and subtraction are used to solve problems.
  • Discussion (5 mins)
    After watching the video, discuss the different types of problems presented (adding to, taking from, putting together, taking apart). Ask students to give their own examples of each type of problem.
  • Practice Problems (10 mins)
    Work through some example problems on the board or using manipulatives (e.g., counters, blocks). Focus on problems that involve different situations (adding to, taking from). Use the format from the video: [Number] + [Number] = [Answer] or [Number] - [Number] = [Answer].
  • Independent Practice (10 mins)
    Have students work on their own or in pairs to solve addition and subtraction word problems within 20. Provide worksheets or use online interactive exercises.
  • Wrap Up (5 mins)
    Review the key concepts of addition and subtraction. Ask students to share what they learned and any strategies they found helpful for solving problems.

Interactive Exercises

  • Number Line Addition and Subtraction
    Use a number line to practice adding and subtracting. Start at a number and hop forward to add, or hop backward to subtract.
  • Manipulative Math
    Use counters, blocks, or other manipulatives to physically represent addition and subtraction problems. For example, to solve 5 + 3, students would put out 5 counters and then add 3 more.

Discussion Questions

  • Can you give me an example of a time when you added things together?
  • What's the difference between adding and subtracting?
  • How can drawing a picture help you solve a math problem?
  • If I have 10 cookies and I eat 3, how many cookies do I have left? What kind of math problem is this?

Skills Developed

  • Problem-solving
  • Critical thinking
  • Mathematical reasoning
  • Number Sense

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:

What is 5 + 3?

Correct Answer: 8

Question 4:

What is 10 - 4?

Correct Answer: 6

Question 5:

Lisa has 6 apples. She gives 2 to her friend. How many apples does Lisa have left?

Correct Answer: 4

Question 6:

Tom has 4 toy cars. Maria has 5 toy cars. How many toy cars do they have together?

Correct Answer: 9

Question 7:

What number is missing? 7 + ___ = 10

Correct Answer: 3

Question 8:

What number is missing? 12 - ___ = 8

Correct Answer: 6

Question 9:

Which of these means to take away?

Correct Answer: -

Question 10:

Which of these means to put together?

Correct Answer: +

Fill in the Blank Questions

Question 1:

When we add, the number gets _________.

Correct Answer: bigger

Question 2:

When we subtract, the number gets _________.

Correct Answer: smaller

Question 3:

6 + 4 = _________

Correct Answer: 10

Question 4:

9 - 2 = _________

Correct Answer: 7

Question 5:

If I have 8 pencils and I give away 3, I have _______ pencils left.

Correct Answer: 5

Question 6:

If I have 5 cookies and I get 4 more, I have ________ cookies.

Correct Answer: 9

Question 7:

The sign for adding is _________.

Correct Answer: +

Question 8:

The sign for subtracting is _________.

Correct Answer: -

Question 9:

5 + ____ = 7

Correct Answer: 2

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.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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