Count by 9915 (Skip Counting by 9915s)

Count by 9915

Here we will show you how to count by 9915, discuss counting by 9915 patterns, and tell you why knowing how to count by 9915 matters. To start off, note that Count by 9915 means counting in 9915s, or count by nine thousand nine hundred fifteens, and it is also called skip counting by 9915.

How to count by 9915
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 9915, we count 9915, 19830, 29745, 39660, and so on.

In other words, to count in intervals of 9915 or skip counting by 9915, we start with 9915 and then add 9915 to get the next number, and then continue adding 9915 to the previous number to keep counting by 9915, like this:

9915
9915 + 9915 = 19830
19830 + 9915 = 29745
29745 + 9915 = 39660
39660 + 9915 = 49575
...

You can of course skip count by 9915 forever, so it is impossible to make a list of all numbers, but below is a Count by 9915 Chart of the first 100 numbers to get you started.

Looking at the chart above, you will see that the first column has the first ten numbers you get when you skip count by 9915, the second column has the next ten numbers you get when you skip count by 9915, and so forth.

Count by 9915 Patterns
We organized the Skip Counting by 9915s Chart above in 10 rows and 10 columns so you can easily identify patterns.

Skip counting always creates patterns. Figuring out these patterns may help you if want to count by 9915, but don't have the Counting by 9915s Chart above. Obviously, one pattern with counting by 9915s is that the number increases by 9915.

Furthermore, if you look at each row above, each number in the row has the same last digit (ones place). That means that every tenth number has the same last digit.

If you look down the columns, you will see that the last digit (ones place) repeats itself in blocks of 2 over and over. The pattern of the last digit when you count by 9915 goes 5, 0 and 5, 0 and so on for as long as you count by 9915.

Why Count by 9915?
We think that understanding and learning about skip counting by 9915 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by nine thousand nine hundred fifteen, you are also creating a list of multiples of 9915 that you can use in math when you need the least common multiple. 9915 times n equals the nth multiple or skip count of 9915.

When you skip count by 9915, you are also creating a list of numbers that 9915 is divisible by. On top of that, skip counting by 9915 is the same as making the 9915 times table.

Skip Counting
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Count by 9916
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