Subtracting Two: A Fun Math Adventure!

Math Grades 1st Grade 4:09 Video
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Lesson Description

Learn how to subtract two from numbers up to 11 using fun tools and discover the patterns in subtraction.

Video Resource

Grade 1: Math Lesson # 98 Subtraction Facts - Subtracting Two From A Number

The Eagle's Nest - Our Online Classroom

Duration: 4:09
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Key Concepts

  • Subtraction means taking away.
  • Subtracting two means finding the number that is two less than a given number.
  • There is a pattern when subtracting two from consecutive numbers.

Learning Objectives

  • Students will be able to subtract two from numbers between 3 and 11.
  • Students will be able to identify the pattern when subtracting two from consecutive numbers.
  • Students will be able to use manipulatives (like play-doh) to visualize and solve subtraction problems.

Educator Instructions

  • Introduction (5 mins)
    Start by greeting the students and introducing the topic: subtracting two. Briefly explain that they will learn to take away two from different numbers. Show the video 'Grade 1: Math Lesson # 98 Subtraction Facts - Subtracting Two From A Number' to introduce the concept.
  • Math Facts Review (5 mins)
    Review the subtraction facts presented in the video: 3-2, 4-2, 5-2, 6-2, 7-2, 8-2, 9-2, 10-2, and 11-2. Write these on the board and have the students repeat them aloud as a class.
  • Pattern Recognition (5 mins)
    Draw attention to the pattern in the answers. Explain that when you subtract two, the answer is always two numbers down from the starting number. For example, if you count backward 2 from 5, you get 3. Write the numbers 1-11 on the board and circle the answer for each subtraction problem to visually show the pattern.
  • Manipulative Practice (10 mins)
    Have each student use play-doh or another manipulative (counters, small toys) to practice subtracting two. Start with a number of objects (e.g., 5 play-doh balls), then have them take away two. Ask them how many are left. Repeat with different numbers (3-11).
  • Guided Practice (10 mins)
    Work through several subtraction problems together as a class, using manipulatives or drawing pictures on the board to illustrate the process. Ask students to explain how they are solving each problem. Provide positive reinforcement for correct answers and guide them when they make mistakes.
  • Independent Practice (10 mins)
    Provide students with a worksheet or workbook pages with subtraction problems subtracting two. Have them work independently to solve the problems. Circulate around the room to provide assistance as needed.
  • Wrap-up (5 mins)
    Review the key concepts of the lesson. Ask students to share what they learned about subtracting two and the patterns they observed. Praise their efforts and participation.

Interactive Exercises

  • Play-Doh Subtraction
    Students use play-doh balls to physically take away two from a starting number. They then count the remaining balls to find the answer.
  • Number Line Hop
    Draw a number line from 1 to 11 on the board. For each subtraction problem (e.g., 7-2), students hop backward two spaces on the number line to find the answer.

Discussion Questions

  • What does it mean to subtract?
  • Can you see a pattern when we subtract two from different numbers?
  • How can we use play-doh to help us subtract?

Skills Developed

  • Subtraction skills
  • Pattern recognition
  • Problem-solving
  • Fine Motor Skills

Multiple Choice Questions

Question 1:

What is 4 take away 2?

Correct Answer: 2

Question 2:

What is 6 minus 2?

Correct Answer: 4

Question 3:

What is 8 - 2?

Correct Answer: 7

Question 4:

What is 10 take away 2?

Correct Answer: 8

Question 5:

What is 3 minus 2?

Correct Answer: 1

Question 6:

If you have 5 cookies and you eat 2, how many do you have left?

Correct Answer: 3

Question 7:

What is 7 take away 2?

Correct Answer: 5

Question 8:

What is 9 - 2?

Correct Answer: 7

Question 9:

What is 11 take away 2?

Correct Answer: 9

Question 10:

What is 4 minus 2?

Correct Answer: 2

Fill in the Blank Questions

Question 1:

5 - 2 = ____

Correct Answer: 3

Question 2:

7 - 2 = ____

Correct Answer: 5

Question 3:

9 - 2 = ____

Correct Answer: 7

Question 4:

3 - 2 = ____

Correct Answer: 1

Question 5:

6 - 2 = ____

Correct Answer: 4

Question 6:

10 - 2 = ____

Correct Answer: 8

Question 7:

8 - 2 = ____

Correct Answer: 6

Question 8:

11 - 2 = ____

Correct Answer: 9

Question 9:

4 - 2 = ____

Correct Answer: 2

Question 10:

If you have 6 toys and give away 2, you have ____ left.

Correct Answer: 4

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. 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.

Teaching Materials

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