Tens and Ones:

Aya is practicing a new piano song today. The music is very challenging, so she’s practicing the song measure by measure. A measure is a section of music between two bar lines, just like this.

There are 5 notes in every measure. Let’s help Aya count the notes. 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100. Very good! There are 100 notes in Aya’s piano song.

We found the total number of notes in this song by skip counting by 5s. We can see these numbers even more clearly when we look at a hundreds chart. Here are the numbers we just counted in Aya’s music. What do you notice about them?

Great idea! Each number either has a 5 or a 0 in the ones place. It’s helpful to find patterns like this while skip counting.

Aya has moved on to another piano song now. This song has 10 notes in each measure. We can skip count by 10s to find the total amount of notes in this music. Count with me! 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. Great job!

Remember, it’s important to look for a pattern when skip counting. Here are the numbers we just counted. Do you see a pattern?

That’s right! The one’s place value of each of these numbers is a 0, and the ten’s place value goes up by 1 each time we count. Notice that these numbers are all in one column too. How interesting!

Hundreds charts are so helpful because they show us numbers 1 through 100 in an organized way. Each line and column has 10 numbers in it, so we can use them to help us skip count easily.

Say Aya needed to skip count the notes in her music by ten, starting at note 11. We can use the hundreds chart to help her. Watch! 11, 21, 31, 41, 51, 61, 71, 81, 91. What patterns do you see?

Yes! We can see that the one’s place value is always 1 and the ten’s place value goes up by 1. We also see that these numbers are in a column and are all odd numbers.

Wow! If we look closely, we can actually see patterns in each column of the hundreds chart.

Look at the ones places in each column, the number stays the same: 1, 2, 3, 4, 5, 6, 7, 8, 9, 0.

Now look at the tens places, they go up by 1, starting at 11: 1, 2, 3, 4, 5, 6, 7, 8, 9. The column with multiples of 10 is a little different. The ten’s place value begins with a 1 on the first column, see? There are so many patterns in a hundreds chart. I challenge you to pause the video to find a few more on your own!

Aya needs our help to skip count once more. This time we need to skip count by 10s, starting at the number 7. Can you use the hundreds chart to help? What number will you begin counting with?

That’s right! 7, 17, 27, 37, 47, 57, 67, 77, 87, 97. Great job!

Using a hundreds chart helps us easily find patterns while skip counting. Thank you for helping Aya count the notes in her piano songs!