Number Explorers: Finding Missing Numbers to 120!

Math Grades 1st Grade 1:53 Video
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Lesson Description

Let's become number explorers and discover missing numbers between 0 and 120! We'll learn to count forward and backward to find the missing pieces in number sequences.

Video Resource

Missing numbers between 0 and 120 | Counting | Early Math | Khan Academy

Khan Academy

Duration: 1:53
Watch on YouTube

Key Concepts

  • Counting sequence
  • Number recognition
  • Identifying preceding and succeeding numbers

Learning Objectives

  • Students will be able to identify the missing number in a sequence between 0 and 120.
  • Students will be able to determine the number that comes before or after a given number within the range of 0-120.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students to count aloud as a class from 1 to 20. Then, briefly introduce the concept of number sequences and missing numbers. Explain that today they will be number explorers finding missing numbers!
  • Video Viewing (7 mins)
    Play the Khan Academy video 'Missing numbers between 0 and 120'. Encourage students to pay attention to how the narrator identifies the missing numbers.
  • Guided Practice (10 mins)
    After the video, write simple number sequences on the board with one number missing (e.g., 10, 11, __, 13, 14). Ask students to identify the missing number and explain their reasoning. Gradually increase the difficulty by using numbers closer to 120 (e.g., 107, 108, __, 110).
  • Independent Practice (10 mins)
    Provide students with a worksheet containing various number sequences with missing numbers. Have them work independently to fill in the missing numbers.
  • Wrap Up (3 mins)
    Review the answers to the worksheet as a class. Emphasize the importance of counting and understanding the order of numbers. Congratulate them on becoming number explorers!

Interactive Exercises

  • Number Line Game
    Create a large number line on the floor using tape or chalk. Call out a number and have a student stand on that number. Then, ask them to hop forward or backward a certain number of spaces and identify the new number they are standing on.
  • Missing Number Cards
    Create number cards from 0 to 120. In small groups, students can take turns drawing a card and then creating a number sequence with that number as the missing number. Other students in the group try to guess the missing number.

Discussion Questions

  • What strategies did you use to find the missing numbers?
  • How does knowing the number before and after help you find the missing number?

Skills Developed

  • Number sense
  • Counting skills
  • Problem-solving

Multiple Choice Questions

Question 1:

What number comes after 5?

Correct Answer: 6

Question 2:

What number comes before 10?

Correct Answer: 9

Question 3:

What number is missing: 20, 21, ____, 23?

Correct Answer: 22

Question 4:

What number is missing: 105, 106, ____, 108?

Correct Answer: 107

Question 5:

Which number comes right after 118?

Correct Answer: 119

Question 6:

Which number comes right before 102?

Correct Answer: 101

Question 7:

What number is missing: 8, 9, 10, ____, 12?

Correct Answer: 11

Question 8:

What number is missing: 112, ____, 114, 115?

Correct Answer: 113

Question 9:

What number comes after 110?

Correct Answer: 111

Question 10:

What number is missing: 97, 98, ____, 100?

Correct Answer: 99

Fill in the Blank Questions

Question 1:

The number after 2 is ____.

Correct Answer: 3

Question 2:

The number before 7 is ____.

Correct Answer: 6

Question 3:

12, 13, ____, 15

Correct Answer: 14

Question 4:

100, 101, ____, 103

Correct Answer: 102

Question 5:

____, 4, 5, 6

Correct Answer: 3

Question 6:

115, ____, 117, 118

Correct Answer: 116

Question 7:

8, ____, 10, 11

Correct Answer: 9

Question 8:

____, 21, 22, 23

Correct Answer: 20

Question 9:

107, 108, 109, ____

Correct Answer: 110

Question 10:

119 is before ____

Correct Answer: 120

Educational Standards

CCSS.Math.Content.1.NBT.A.1:Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral. CCSS.Math.Content.1.OA.C.5:Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

Teaching Materials

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