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Find the Missing Number on a Number Line

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Find the Missing Number on a Number Line
CCSS.MATH.CONTENT.2.OA.A.1

Basics on the topic Find the Missing Number on a Number Line

Content

Missing Addend Number Line

In this video Skylar and Henry are going on their annual forest hike! They decide to follow a flower trail to see where it will lead them, but there’s a problem, some of the flowers are missing! They need to learn about missing numbers on a number line while following the trail. Watch this video to learn more about how to find missing addend with a number line.

How Do You Find the Missing Number in a Number Line?

A number line is a diagram in which numbers are represented as points on a line. They count by a specific number, sometimes by ones, twos, fives. or even tens. But, what happens when a number is missing? Follow these steps to find missing numbers on a number line;

  • First: look at the whole number line.

  • Then: look for the missing number line pattern - what the number line is counting by.

  • Next: count using this pattern to find the missing number!

  • Finally: reread the number line again to make sure it is correct.

Fill in the Missing Numbers on a Number Line - Practice

How can you figure out missing numbers using patterns on a number line? With the below number line fill in missing numbers to practice!

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Can you figure out which numbers are missing from this number line?

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This number line is missing the numbers forty-five and fifty-five!

Missing Numbers Number Line - Summary

When solving for missing numbers on a number line;

  • First: look at the whole number line.

  • Then: look for the missing number line pattern - what the number line is counting by.

  • Next: count using this pattern to find the missing number!

  • Finally: reread the number line again to make sure it is correct.

Looking for extra practice? After this video check out the interactive exercises and missing addend worksheet with number line.

Transcript Find the Missing Number on a Number Line

: "What a cool forest for our annual exploration hike!" : "There's a trail of flowers... let's follow it!" : "We can count them so we don't get lost." : "But, there are some missing... what should we do?" Let's help Skylar and Henry learn about how to "find the missing number on a number line" so they don't get lost! You may have learned about number lines before. A number line is a diagram in which numbers are represented as points on a line. They count by a specific number, sometimes by ones, twos, fives. or even tens. But, what happens when a number is missing? When a number is missing on a number line you can follow four steps... first, look at the whole number line. Then, look for the pattern, or what the number line is counting by. Next, count using this pattern to find the missing number! Finally, reread the number line again to make sure it is correct. Now, let's help Skylar and Henry! After counting flowers, they see that there are some missing! We can put each flower on the number line to find which are missing. To find the missing number using a number line... first, look at the whole number line. Next, look for the pattern, or what the number line is counting by. You can do that by counting the numbers shown! This number line is counting by ones. Then, count using this pattern to find the missing number. Count with me! Twenty-three (...) twenty-four (...) twenty-five (...) twenty-six (...) twenty-seven (...) twenty-eight! So, our missing numbers are TWENTY-FIVE, TWENTY-SEVEN and TWENTY-EIGHT. Finally, read the number line again to make sure it is correct. That means if Skylar and Henry fill in those numbers while counting, they won't get lost! After walking for a bit, there is another problem. MORE flowers are missing! We can practice finding the missing numbers to help! First, look at the whole number line. This number line starts at thirty-five. Then, look for the pattern, or what the number line is counting by. What is this number line is counting by? (...) fives! Next, count using this pattern to find the missing number! Count with me! Thirty-five (...) forty (...) forty-five (...) fifty (...) fifty-five (...) sixty! Our missing numbers are FORTY-FIVE and FIFTY-FIVE. Finally, read the number line again to make sure it is correct. Skylar and Henry haven't gotten lost yet, right? Oh good, but, what's this? More missing flowers! Let's help one last time. First, look at the whole number line. This number line starts at seventy. Then, look for the pattern, or what the number line is counting by. Can you tell the pattern for this number line? (...) tens! Next, count using this pattern to find the missing number! Count with me. Seventy (...) eighty (...) ninety (...) one hundred! Our missing numbers are eighty and one-hundred. Before we see where the flower trail leads to, let's review. Today we learned about how to find the missing number on a number line. Number lines are diagrams that use points to represent the numbers... and that they can count by different patterns! When using a number line to find a missing number... First, look at the whole number line. Then, look for the pattern, or what the number line is counting by. Next, count using this pattern to find the missing number! Finally, read the number line again to make sure it is correct. Now, let's see where the trail leads to! : "A GIANT flower tree." : "Quick, let's take a selfie with the polaroid!"

Find the Missing Number on a Number Line exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Find the Missing Number on a Number Line.
  • Number line patterns.

    Hints

    Here is an example of counting by ones:

    12, 13, 14, 15

    Here is an example of counting by fives:

    30, 35, 40, 45

    Here is an example of counting by tens:

    40, 50, 60, 70

    Solution

    The number line patterns count by ones, fives, tens, and fives.

  • Skylar and Henry go on a hike.

    Hints

    The first step when a number is missing on a number line is to look at the whole number line.

    The second step when a number is missing on a number line is to look for the pattern or what the number line is counting by.

    The third step when a number is missing on a number line is to count using this pattern to find the missing number.

    The fourth step when a number is missing on a number line is to reread the number line again to make sure it is correct.

    Solution

    The number line counts by ones.

    • The missing numbers are 46, 49, and 51.
  • Help Skylar and Henry find the trail.

    Hints

    What is the pattern counting by?

    Here is an example of counting by fives:

    15, 20, 25, 30

    What comes after 65 when counting by fives? What comes after 80 when counting by fives?

    Solution

    The number line counts by fives.

    • The missing numbers are 70 and 85.
  • Count the flowers.

    Hints

    What is the pattern counting by?

    Here is an example of counting by tens:

    20, 30, 40, 50

    What comes after 60 when counting by tens? What comes after 90 when counting by tens?

    Solution

    The number line counts by tens.

    • The missing numbers are 70 and 100.
  • What are the steps of finding a missing number on a number line?

    Hints

    The image provides an example of the first step of finding a missing number on a number line.

    The image provides an example of the second step of finding a missing number on a number line.

    The image provides an example of the third step of finding a missing number on a number line.

    Solution

    4 steps when a number is missing on a number line:

    1. Look at the whole number line.
    2. Look for the pattern or what the number line is counting by.
    3. Count using this pattern to find the missing number.
    4. Reread the number line again to make sure it is correct.
  • Missing numbers.

    Hints

    What is the pattern counting by?

    Count back by tens from 90 on the number line to find the initial missing number.

    Solution

    The number line counts by tens.

    • Count back by tens on the number line from 90 to find the initial missing number, 80.
    • The missing numbers are 80, 110, and 140.