Double Plus One Subtraction Fun!

Math Grades 1st Grade 7:20 Video
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Lesson Description

Learn how to use your Double Plus One addition facts to help you subtract! We'll use flashcards and fun shapes to understand how addition and subtraction are related.

Video Resource

Grade 1: Saxon Math Lesson #125 Subtraction Facts - Subtracting Using the Doubles Plus One Addition

The Eagle's Nest - Our Online Classroom

Duration: 7:20
Watch on YouTube

Key Concepts

  • Fact families
  • Doubles plus one addition facts
  • Relationship between addition and subtraction

Learning Objectives

  • Students will be able to recall 'doubles plus one' addition facts.
  • Students will be able to use 'doubles plus one' addition facts to solve subtraction problems.
  • Students will be able to recognize the relationship between addition and subtraction within fact families.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing simple subtraction facts using flashcards (as demonstrated in the video). Ask students to say the answer aloud as quickly as possible. This will help activate prior knowledge.
  • Review Doubles Plus One Addition (5 mins)
    Review 'doubles plus one' addition facts. For example: 2 + 2 = 4, so 2 + 3 = 5. Use fingers or drawings to help students visualize the concept. Emphasize that 'doubles plus one' is just one more than a doubles fact.
  • Connecting Addition and Subtraction (10 mins)
    Explain that subtraction is the opposite of addition. Use the examples from the video (5 - 2 = 3 because 2 + 3 = 5). Draw triangles or other shapes to represent the numbers, and physically remove shapes to demonstrate subtraction. Show how the same shapes can be used to show the addition problem.
  • Practice with Manipulatives (10 mins)
    Give each student a set of small manipulatives (e.g., counters, blocks). Present subtraction problems based on 'doubles plus one' addition facts (e.g., 7 - 3 = ?). Guide students to use the manipulatives to solve the problems. Encourage them to think about the related addition fact (3 + ? = 7).
  • Independent Practice (10 mins)
    Provide a worksheet with 'doubles plus one' subtraction problems. Have students solve the problems independently, using manipulatives if needed. Encourage them to write the related addition fact next to each subtraction problem.

Interactive Exercises

  • Fact Family Fun
    Write a 'doubles plus one' addition fact on the board (e.g., 4 + 5 = 9). Ask students to write the other addition fact (5 + 4 = 9) and the two related subtraction facts (9 - 4 = 5 and 9 - 5 = 4).
  • Shape Subtraction
    Draw a group of shapes on the board (e.g., 7 circles). Ask students to identify a 'doubles plus one' subtraction problem that matches the shapes (e.g., 7 - 3 = 4). Have them circle the shapes that are being subtracted.

Discussion Questions

  • How does knowing your addition facts help you with subtraction?
  • Can you give me an example of a 'doubles plus one' addition fact and the related subtraction facts?

Skills Developed

  • Subtraction
  • Addition
  • Problem-solving
  • Fact recall
  • Understanding relationships between numbers

Multiple Choice Questions

Question 1:

What is 5 take away 2?

Correct Answer: 3

Question 2:

What is 7 take away 4?

Correct Answer: 3

Question 3:

What is 9 take away 5?

Correct Answer: 4

Question 4:

If 3 + 4 = 7, then what is 7 take away 3?

Correct Answer: 4

Question 5:

If 4 + 5 = 9, then what is 9 take away 4?

Correct Answer: 5

Question 6:

What is 5 + 4?

Correct Answer: 9

Question 7:

What is 3 + 4?

Correct Answer: 7

Question 8:

What does 'take away' mean?

Correct Answer: Subtract

Question 9:

Which number sentence is in the fact family of 2+3=5?

Correct Answer: 5-3=2

Question 10:

If I have 5 cookies and eat 2, how many are left?

Correct Answer: 3

Fill in the Blank Questions

Question 1:

5 take away 3 is ____

Correct Answer: 2

Question 2:

7 take away 3 is ____

Correct Answer: 4

Question 3:

9 take away 4 is ____

Correct Answer: 5

Question 4:

If 2 + 3 = 5, then 5 take away 2 is ____

Correct Answer: 3

Question 5:

If 4 + 3 = 7, then 7 take away 4 is ____

Correct Answer: 3

Question 6:

Another word for subtraction is _____.

Correct Answer: take away

Question 7:

5 + 4 = ____

Correct Answer: 9

Question 8:

3 + 4 = ____

Correct Answer: 7

Question 9:

Knowing addition facts helps with _____.

Correct Answer: subtraction

Question 10:

A group of related addition and subtraction facts is called a fact ______.

Correct Answer: family

Educational Standards

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.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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