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Counting to 120

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Counting to 120
CSS.MATH.CONTENT.1.NBT.A.1

Basics on the topic Counting to 120

Content

In this Count to 120 Video

It’s here! Henry and Skylar’s first Puzzle of the Month! This month they must complete a count to 120 chart since there are several numbers missing. In this video, Skylar and Henry learn how to count to 120 by 1s, starting at any number less than one hundred twenty.

How to Count to 120

The numbers one hundred to one hundred twenty follow a pattern when counting just like the numbers one to one hundred do! We can use a hundreds chart to help us see these patterns.

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One through ten always go in this order in the ones place. Then, one through ten follow the same pattern in all the rows that follow! Only the number in the tens place changes as we move down the rows.

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In this row, the tens place always has a one and the number in the ones place follows the one through ten pattern: eleven, twelve, thirteen, and so on. Instead of the last number changing to ten, it now changes from nineteen to twenty.

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The same patterns follow when we count above one hundred! This time we just say 'one hundred' first! One hundred-one, one hundred-two, one hundred-three and so on.

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To find a missing number in the chart, go to the number before it. Then, start counting-on using our pattern to figure it out!

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Summary of Steps: Count to 120

I can count to 120 by following these steps!

  • The numbers one through one hundred twenty follow a pattern when counting. The pattern starts with one through ten. Then, the tens place changes by one as we go down each row.

  • The same patterns work when we count ABOVE one hundred. This time we just say 'one hundred' before we start!

  • To find a missing number in a one hundred twenty chart, go to the number before it.

  • Then, start counting on using our pattern to find what's missing!

Practice with Count to 120 Exercises

Have you practiced yet? On this website, you can also find count to 120 worksheets and count to 120 activities.

Transcript Counting to 120

It’s here! Henry and Skylar’s first delivery from Puzzle of the Month Club! This month it’s a one hundred twenty chart except there are numbers missing! They need to count within one hundred twenty to solve the puzzle and send away for the prize! But how?! Let's help Henry and Skylar by learning about, "Counting to One Hundred Twenty!" The numbers one hundred to one hundred twenty follow a pattern when counting just like the numbers one to one hundred do! We can use a hundreds chart to help up see these patterns. One through ten always go in this order in the ones place. Then, one through ten follow the same pattern in all the rows that follow! Only the number in the tens place changes as we move down the rows. In this row, the tens place always has a two and the number in the ones place follows the one through ten pattern. See twenty-one, twenty-two, twenty-three and so on. Instead of the last number changing to ten, it now changes from twenty-nine to thirty. The same patterns follow when we count above one hundred! The same patterns follow when we count above one hundred! This time we just say 'one hundred' first! One hundred one, one hundred two, one hundred three and so on. To find a missing number in the chart, go to the number before it. Then, start counting-on using our pattern to figure it out! The missing number is here in the row starting with twenty-one. First we read the number before the missing one... which is twenty-five. Now we can start counting-on from twenty-five using the pattern. Twenty-five, twenty-six! The missing number is twenty-six. There is a two in the tens place like all the numbers in that row and the ones place follows the one through ten pattern after five comes six! Let's try the next two missing numbers! They are here in the row starting with one hundred one. First we read the number before them which is one hundred three. Now we can start counting from one hundred three using the same pattern. One hundred three, one hundred four, one hundred five! The missing numbers are one hundred four and one hundred five! They start with one hundred like all the numbers in that row... and the next numbers follow the one through ten pattern after three comes four then five! As Skylar and Henry find the last few numbers, let's review! Today we learned about counting to one hundred twenty! The numbers one through one hundred twenty follow a pattern when counting. The pattern starts with one through ten. Then, the tens place changes by one as we go down each row. The same patterns work when we count above one hundred. This time we just say 'one hundred' before we start! To find a missing number in a one hundred twenty chart, go to the number before it. Then, start counting on using our pattern to find what's missing! Look! Henry and Skylar solved the puzzle. Now they can send away for the prize, a box of chocolate covered flies! "That is not a prize! That is gross!" "What?! This is the best prize Frogger's Digest has ever had." "Frogger's Digest!? I thought this was the Puzzle of the Month Club!"

Counting to 120 exercise

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Counting to 120.
  • Use the 120 chart to figure out the missing number.

    Hints

    Remember, to find the missing number, start at the number before and count on.

    Remember, look for patterns in the rows and columns.

    Solution

    We start at the number before the missing number, 101. 101, 102. By counting up, we discover the missing number is 102. This follows the patterns of the other rows and columns.

  • Identify the missing numbers.

    Hints

    Remember, read the number before, and use the pattern to count and figure out the missing number.

    Look at this chart. Find the number before and count on to determine the missing numbers.

    Solution

    By counting on, we identify the missing numbers. 111, 112, 113, 114, 115, 116, 117, 118. Even though we are above 100, the pattern stays the same.

  • Complete the row.

    Hints

    Remember, in this row, the tens place always has a two, and the number in the ones place changes.

    Look at this example of a different row to see the pattern.

    Solution

    To fill in this row, we follow the pattern in the ones place. We look at the number before, and count on. 21, 22, 23, 24, 25, 26, 27, 28, 29. The pattern continues in the ones place.

  • Complete the column.

    Hints

    Remember, only the number in the tens place changes as we move down the rows.

    Look at the number before, and the number after. Count on to find what number is missing.

    Solution

    The missing numbers are 32, 42, 62, 72, and 82! As we moved down the rows of the hundreds chart, only the tens place changed.

  • How many chocolate flies?

    Hints

    Remember, the same pattern continues past 100. Start at the number before, and count on.

    Remember, we use the chart to solve for the missing number. In this chart, 34 is the number before this missing number. We count on to solve for the missing number. 34, 35. The missing number is 35.

    Solution

    Henry won 109 chocolate flies! The number before was 108, and we counted on. 108, 109.

  • Complete the column past 100.

    Hints

    Remember, look at the number before the missing number, and the number after. Count on to find the missing number.

    Remember, the ones place changes in rows, and the tens place changes in columns.

    Solution

    The same patterns continue when we count above 100. We found the missing numbers by going to the number before it, and counting on. For example, the first missing number was 65. We went to 64, and counted on to get 65. The same pattern was used to find the missing number 119. We start at the number before, 118, and count on to get 119. Now Skylar and Henry can complete the puzzle!