Subtraction Superstars: Mastering Facts with a Difference of One!

Math Grades 1st Grade 3:44 Video
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Lesson Description

Learn subtraction facts where the difference is one! We'll use flashcards, manipulatives, and even a fun game with pennies to become subtraction superstars!

Video Resource

Grade 1: Saxon Math Lesson #122 Subtraction Facts - Difference of One

The Eagle's Nest - Our Online Classroom

Duration: 3:44
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Key Concepts

  • Subtraction as taking away
  • Subtraction facts with a difference of one
  • Using manipulatives to visualize subtraction

Learning Objectives

  • Students will be able to subtract numbers where the difference is one.
  • Students will be able to use manipulatives (linking cubes, pennies) to represent subtraction.
  • Students will be able to identify the pattern in subtraction facts with a difference of one.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing what subtraction means ('taking away'). Ask students for examples of when they subtract in their daily lives (e.g., eating cookies, sharing toys).
  • Flashcard Review (5 mins)
    Show flashcards with subtraction problems like 3-2, 4-3, 5-4, etc. Encourage students to quickly answer. Emphasize the pattern that the answer is always one when the numbers are one apart.
  • Manipulative Practice (10 mins)
    Use linking cubes to demonstrate subtraction. For example, start with 5 cubes and take away 4. Have students explain what they are doing and the result. Repeat with different numbers. Transition to using pennies for subtraction, reinforcing the 'banker and robber' game.
  • Game Time (10 mins)
    Play the 'banker and robber' game. One student is the 'banker' and puts out a number of pennies. The other student is the 'robber' and takes away a specified amount. The 'banker' then counts how many pennies are left.
  • Wrap Up (5 mins)
    Review the pattern in subtraction facts where the difference is one. Ask students to give examples of such facts. Reiterate that when the numbers are one apart, the answer is always one.

Interactive Exercises

  • Linking Cube Subtraction
    Provide each student with a set of linking cubes. Call out subtraction problems (e.g., 'Start with 6 cubes, take away 5'). Students use the cubes to solve the problem and show their answer.
  • Penny Subtraction Game
    Have students pair up and play the 'banker and robber' game. One student puts out a number of pennies, the other student takes some away, and then they count the remaining pennies together.

Discussion Questions

  • What does it mean to subtract?
  • Can you think of a time when you had to subtract something?
  • What pattern did you notice in the subtraction problems we did today?
  • Why is it helpful to use pennies to practice subtraction?

Skills Developed

  • Subtraction skills
  • Problem-solving skills
  • Pattern recognition
  • Using manipulatives

Multiple Choice Questions

Question 1:

What does it mean to subtract?

Correct Answer: To take away numbers

Question 2:

What is 4 take away 3?

Correct Answer: 1

Question 3:

What is 7 - 6?

Correct Answer: 1

Question 4:

If you have 5 cookies and you eat 4, how many cookies are left?

Correct Answer: 1

Question 5:

What is 9 take away 8?

Correct Answer: 1

Question 6:

What is 6 - 5?

Correct Answer: 1

Question 7:

If the numbers we take away are right next to each other, what is the answer always?

Correct Answer: One

Question 8:

Which of these shows taking away?

Correct Answer: -

Question 9:

What is 8 - 7?

Correct Answer: 1

Question 10:

If you have 10 pennies and you give away 9, how many pennies do you have left?

Correct Answer: 1

Fill in the Blank Questions

Question 1:

Subtraction means to _____ _____.

Correct Answer: take away

Question 2:

3 take away 2 is _____.

Correct Answer: 1

Question 3:

5 - 4 = _____.

Correct Answer: 1

Question 4:

If the numbers are only one away from each other, the answer is always _____.

Correct Answer: 1

Question 5:

6 take away 5 is _____.

Correct Answer: 1

Question 6:

8 - 7 = _____.

Correct Answer: 1

Question 7:

9 take away 8 is _____.

Correct Answer: 1

Question 8:

7 - 6 = _____.

Correct Answer: 1

Question 9:

10 take away 9 is _____.

Correct Answer: 1

Question 10:

We can use _______ to help us with subtraction.

Correct Answer: pennies

Educational Standards

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.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.

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