Hazel Horse & Pauly Pony's Fence: Adding and Subtracting Fun!

Math Grades 1st Grade 3:30 Video
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Lesson Description

Learn how to add and subtract numbers within 100 by helping a farmer build fences for Hazel Horse and Pauly Pony!

Video Resource

Fence posts for horses | Addition and subtraction within 100 | Early Math | Khan Academy

Khan Academy

Duration: 3:30
Watch on YouTube

Key Concepts

  • Addition within 100
  • Word Problems
  • Regrouping (carrying over)

Learning Objectives

  • Students will be able to solve addition word problems within 100.
  • Students will be able to understand and apply the concept of regrouping (carrying over) when adding two-digit numbers.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students if they have ever helped build something. Introduce Hazel Horse and Pauly Pony. Explain that a farmer needs help figuring out how many fence posts he used in all and that this video will help us solve the problem.
  • Video Viewing (5 mins)
    Play the Khan Academy video: 'Fence posts for horses | Addition and subtraction within 100 | Early Math | Khan Academy'. Encourage students to follow along and pay attention to how the problem is solved.
  • Guided Practice (10 mins)
    After the video, re-emphasize the problem. Write the equation 26 + 19 = ? on the board. Walk through the steps of adding the ones place (6+9) and then the tens place (2+1 + the carried over 1). Emphasize why we regroup and how it works. Use base-ten blocks if available to demonstrate regrouping visually.
  • Independent Practice (10 mins)
    Provide students with similar word problems (e.g., 'Sarah has 32 red apples and 25 green apples. How many apples does she have in all?'). Have them solve the problems individually, showing their work. Circulate to provide assistance as needed.
  • Wrap-up (5 mins)
    Review the key concepts. Ask students to share what they learned. Reiterate the importance of reading word problems carefully and understanding what is being asked.

Interactive Exercises

  • Base-Ten Blocks Activity
    Use base-ten blocks to represent the numbers in the word problem. Physically combine the ones and tens, and then regroup if necessary. This provides a hands-on experience with the concept.
  • Number Line Addition
    Draw a number line from 0 to 50. Start at 26 and jump 19 spaces to find the answer. This reinforces the visual representation of addition.

Discussion Questions

  • What is the word 'in all' telling us to do? (Add)
  • Why do we regroup when adding the ones place? (Because we can only have one digit in the ones place.)
  • Can you think of another word problem where we would need to add?

Skills Developed

  • Addition within 100
  • Problem-solving
  • Place Value Understanding
  • Regrouping

Multiple Choice Questions

Question 1:

What does 'in all' usually mean we need to do?

Correct Answer: Add

Question 2:

What is 10 + 5?

Correct Answer: 15

Question 3:

What is 20 + 10?

Correct Answer: 30

Question 4:

If you have 5 apples and get 3 more, how many do you have?

Correct Answer: 8

Question 5:

What is 11 + 2?

Correct Answer: 13

Question 6:

Which number is bigger? 26 or 19?

Correct Answer: 26

Question 7:

If you have 7 toys and give away 2, how many are left?

Correct Answer: 5

Question 8:

What is 4 + 4?

Correct Answer: 8

Question 9:

Adding means we put numbers _______?

Correct Answer: Together

Question 10:

What number comes after 9?

Correct Answer: 10

Fill in the Blank Questions

Question 1:

10 + 2 = ______

Correct Answer: 12

Question 2:

5 + 5 = ______

Correct Answer: 10

Question 3:

When we add, the numbers get ________.

Correct Answer: bigger

Question 4:

1 + 1 = ________

Correct Answer: 2

Question 5:

If I have 3 cookies and get 2 more, I have _______ cookies.

Correct Answer: 5

Question 6:

6 + 3 = ______

Correct Answer: 9

Question 7:

8 + 2 = ______

Correct Answer: 10

Question 8:

4 + 1 = ______

Correct Answer: 5

Question 9:

7 + 0 = ______

Correct Answer: 7

Question 10:

To find the total, we can ________ the numbers.

Correct Answer: add

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.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.

Teaching Materials

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