Taking One Away: Subtraction Fun!

Math Grades 1st Grade 7:13 Video
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Lesson Description

Learn how to subtract one from numbers using objects and discover the counting pattern before! Get ready for some subtraction fun!

Video Resource

Grade 1: Math Lesson #44 Subtracting 1 From A Number

The Eagle's Nest - Our Online Classroom

Duration: 7:13
Watch on YouTube

Key Concepts

  • Subtraction as taking away
  • Subtracting one results in the preceding number
  • Identifying patterns in subtraction

Learning Objectives

  • Students will be able to subtract 1 from numbers 1-10.
  • Students will be able to identify the number that comes before another number.
  • Students will be able to relate subtraction of 1 to counting backward.

Educator Instructions

  • Introduction (5 mins)
    Begin by watching the YouTube video 'Grade 1: Math Lesson #44 Subtracting 1 From A Number'. Discuss the concept of subtraction as taking away.
  • Math Facts Review (5 mins)
    Review subtraction facts with subtracting one. Practice the facts aloud together as a class: 1-1, 2-1, 3-1, 4-1, 5-1, 6-1, 7-1, 8-1, 9-1, 10-1.
  • Hands-on Activity: Sticks (10 mins)
    Have each student collect 10 small objects (e.g., counters, small blocks, crayons). Guide them to subtract one object at a time, counting how many are left after each subtraction. Model this using the sticks example shown in the video.
  • Number Line Connection (5 mins)
    Draw a number line from 0 to 10 on the board. Demonstrate how subtracting one is like moving one space to the left on the number line.
  • Pattern Recognition (5 mins)
    Reinforce the pattern that subtracting one always gives the number that comes right before. Ask students to predict the answer before actually subtracting.
  • Independent Practice (10 mins)
    Provide students with a worksheet with subtraction problems subtracting one from a number. Ask them to solve each problem independently.

Interactive Exercises

  • Counting Backwards Game
    Start with a number between 2 and 10. Students take turns counting backward by one. For example, if you start with 7, the students would say 6, 5, 4, etc.
  • Object Subtraction
    Provide students with small objects and ask them to subtract one object at a time, stating the subtraction fact (e.g., '5 take away 1 is 4').

Discussion Questions

  • What does it mean to subtract?
  • What happens when you take one away from a number?
  • Can you think of real-life situations where you subtract one from something?

Skills Developed

  • Subtraction skills
  • Number recognition
  • Pattern recognition
  • Following directions

Multiple Choice Questions

Question 1:

What does it mean to subtract?

Correct Answer: To take away

Question 2:

What number comes right before 5?

Correct Answer: 4

Question 3:

If you have 3 cookies and you eat 1, how many cookies do you have left?

Correct Answer: 2

Question 4:

What is 2 take away 1?

Correct Answer: 1

Question 5:

Which of these is a subtraction problem?

Correct Answer: 4 - 1

Question 6:

What is 7 - 1?

Correct Answer: 6

Question 7:

If you have 9 pencils and give 1 to a friend, how many do you have left?

Correct Answer: 8

Question 8:

What number comes right before 10?

Correct Answer: 9

Question 9:

What is 4 take away 1?

Correct Answer: 3

Question 10:

If you have 6 apples and you eat one apple, how many apples do you have?

Correct Answer: 5

Fill in the Blank Questions

Question 1:

Subtracting means to _____ away.

Correct Answer: take

Question 2:

The number that comes right before 4 is _____.

Correct Answer: 3

Question 3:

5 - 1 = _____

Correct Answer: 4

Question 4:

When you subtract 1, you count ____ one number.

Correct Answer: back

Question 5:

The number that comes before 8 is _____

Correct Answer: 7

Question 6:

3 - 1 = _____

Correct Answer: 2

Question 7:

If you take 1 away from 10, you have _____

Correct Answer: 9

Question 8:

6 - 1 = _____

Correct Answer: 5

Question 9:

The number that comes before 2 is _____

Correct Answer: 1

Question 10:

9 - 1 = _____

Correct Answer: 8

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.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). 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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