Subtraction Superstars: Mastering Leftover Facts!

Math Grades 1st Grade 7:50 Video
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Lesson Description

Let's become Subtraction Superstars! We'll learn our 'leftover' subtraction facts and use fun ways to remember them. Get ready to subtract like a pro!

Video Resource

Grade 1: Saxon Math Lesson #128 Leftover Subtraction Facts

The Eagle's Nest - Our Online Classroom

Duration: 7:50
Watch on YouTube

Key Concepts

  • Subtraction as taking away
  • Fact families and related subtraction facts
  • Using manipulatives to visualize subtraction

Learning Objectives

  • Students will be able to accurately solve the 'leftover' subtraction facts.
  • Students will be able to use manipulatives to demonstrate the subtraction process.
  • Students will be able to recognize patterns in related subtraction facts.

Educator Instructions

  • Introduction (5 mins)
    Begin by welcoming the students and briefly reviewing previously learned subtraction facts. Introduce the concept of 'leftover' facts and explain that these are the last few facts they need to learn.
  • Video Viewing (7 mins)
    Play the YouTube video: 'Grade 1: Saxon Math Lesson #128 Leftover Subtraction Facts'. Encourage students to pay close attention to the examples and the use of manipulatives.
  • Guided Practice (10 mins)
    After the video, write the 'leftover' subtraction facts on the board: 6-4, 7-5, 8-6, 9-7, 8-3, 9-3, 8-5, 9-6. Go through each fact, using counters or drawings to visually demonstrate the subtraction process. Emphasize the patterns within the facts (e.g., 6-4=2, 7-5=2, etc.).
  • Independent Practice (8 mins)
    Provide each student with a worksheet containing 'leftover' subtraction problems. Encourage them to use counters or drawings if needed. Walk around the room to provide assistance and answer any questions.
  • Fun with Play-Doh (5 mins)
    Recreate the Play-Doh activity from the video. Have students create small balls of Play-Doh to represent the numbers in the subtraction problems. Then, have them physically remove the correct number of balls to find the answer.

Interactive Exercises

  • Fact Family Flashcards
    Create flashcards with the 'leftover' subtraction facts on one side and the answer on the other. Have students practice recalling the answers quickly.
  • Subtraction Number Line
    Use a number line to visually demonstrate the subtraction process. Start at the larger number and count backwards the number being subtracted to find the answer.

Discussion Questions

  • What happens when you take away a number from another number?
  • Can you think of a time when you used subtraction today?

Skills Developed

  • Subtraction fluency
  • Problem-solving
  • Visual representation of mathematical concepts

Multiple Choice Questions

Question 1:

What is 6 take away 4?

Correct Answer: 2

Question 2:

What is 7 minus 5?

Correct Answer: 2

Question 3:

What is 8 take away 6?

Correct Answer: 2

Question 4:

What is 9 minus 7?

Correct Answer: 2

Question 5:

What is 8 take away 3?

Correct Answer: 5

Question 6:

What is 9 minus 3?

Correct Answer: 6

Question 7:

What is 8 take away 5?

Correct Answer: 3

Question 8:

What is 9 minus 6?

Correct Answer: 3

Question 9:

If you have 7 candies and eat 5, how many are left?

Correct Answer: 2

Question 10:

If you have 9 toy cars and give away 3, how many do you have left?

Correct Answer: 6

Fill in the Blank Questions

Question 1:

6 - 4 = ____

Correct Answer: 2

Question 2:

7 - 5 = ____

Correct Answer: 2

Question 3:

8 - 6 = ____

Correct Answer: 2

Question 4:

9 - 7 = ____

Correct Answer: 2

Question 5:

8 - 3 = ____

Correct Answer: 5

Question 6:

9 - 3 = ____

Correct Answer: 6

Question 7:

8 - 5 = ____

Correct Answer: 3

Question 8:

9 - 6 = ____

Correct Answer: 3

Question 9:

If you have 8 cookies and eat 3, you have ____ cookies left.

Correct Answer: 5

Question 10:

If you have 9 pencils and give 6 away, you have ____ pencils left.

Correct Answer: 3

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.B.4:Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8. 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.

Teaching Materials

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