Blast Off with Math: Counting Backwards and Adding One!

Math Grades 1st Grade 9:15 Video
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Lesson Description

Let's learn to count backwards from 10 and discover the magic of adding one to a number. Get ready for some math fun!

Video Resource

Grade 1: Math Lesson #34 Counting Backwards From 10 To 1; Adding One To A Number

The Eagle's Nest - Our Online Classroom

Duration: 9:15
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Key Concepts

  • Counting backwards from 10
  • Adding one to a number
  • Commutative property of addition

Learning Objectives

  • Students will be able to count backwards from 10 to 0.
  • Students will be able to add one to a number within 10.
  • Students will understand that changing the order of numbers when adding one doesn't change the answer.

Educator Instructions

  • Introduction (5 mins)
    Start by reviewing numbers 1-10. Ask students what number comes after 3, 6, 9. Then, introduce the idea of counting backwards like a rocket blasting off!
  • Counting Backwards Practice (5 mins)
    Practice counting backwards from 10 together as a class, using actions like crouching down and jumping up at zero, like the video suggests. Have individual students take turns leading the countdown.
  • Adding One with Number Line (7 mins)
    Use a number line (either drawn on the board or using individual number lines) to visually demonstrate adding one to a number. Start with examples like 2 + 1, 5 + 1, and 8 + 1. Emphasize moving one space to the right on the number line.
  • Commutative Property Exploration (8 mins)
    Introduce the idea that the order of numbers doesn't matter when adding. Demonstrate with examples like 3 + 1 = 4 and 1 + 3 = 4. Use manipulatives like blocks or counters to show this concept concretely.
  • Adding One with Manipulatives (5 mins)
    Have students use manipulatives (e.g., counters, small toys) to represent addition problems involving adding one. For example, for 4 + 1, they would put out 4 counters, then add one more, and count the total.

Interactive Exercises

  • Number Line Hop
    Create a large number line on the floor with tape. Call out addition problems (e.g., 6 + 1). Have students hop along the number line to solve the problem.
  • Adding One Bingo
    Create bingo cards with numbers 1-10. Call out addition problems (e.g., 4 + 1). Students cover the answer (5) on their bingo card.

Discussion Questions

  • Can you think of a time when you need to count backwards?
  • What happens when you add one to a number? Does it get bigger or smaller?
  • Does it matter if we say 2 + 1 or 1 + 2? Why or why not?

Skills Developed

  • Counting backwards
  • Addition
  • Problem-solving
  • Number Sense

Multiple Choice Questions

Question 1:

What number comes BEFORE 5 when we count backwards?

Correct Answer: 4

Question 2:

What is 3 + 1?

Correct Answer: 4

Question 3:

What is 1 + 7?

Correct Answer: 8

Question 4:

Which number is bigger: 6 or 7?

Correct Answer: 7

Question 5:

When you add one, does the number get bigger or smaller?

Correct Answer: Bigger

Question 6:

What number comes right after 8?

Correct Answer: 9

Question 7:

If you have 4 cookies and I give you 1 more, how many cookies do you have?

Correct Answer: 5

Question 8:

What is zero plus one? 0 + 1 = ?

Correct Answer: 1

Question 9:

Is 2 + 1 the same as 1 + 2?

Correct Answer: Yes

Question 10:

Which number comes right BEFORE the number 1?

Correct Answer: 0

Fill in the Blank Questions

Question 1:

When we count backwards from 10, the number before 1 is _____.

Correct Answer: 0

Question 2:

5 + 1 = _____.

Correct Answer: 6

Question 3:

If you add 1 to 9, you get _____.

Correct Answer: 10

Question 4:

The number after 4 is _____.

Correct Answer: 5

Question 5:

2 + _____ = 3

Correct Answer: 1

Question 6:

If you count backwards 1 number from 7, you get _____.

Correct Answer: 6

Question 7:

6 plus one is _____.

Correct Answer: 7

Question 8:

_____ + 1 = 2

Correct Answer: 1

Question 9:

When you add _____ to a number, it gets bigger.

Correct Answer: 1

Question 10:

One plus one equals _____

Correct Answer: 2

Educational Standards

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.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.3:Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

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