Count by 4009 (Skip Counting by 4009s)

Count by 4009

Here we will show you how to count by 4009, discuss counting by 4009 patterns, and tell you why knowing how to count by 4009 matters. To start off, note that Count by 4009 means counting in 4009s, or count by four thousand nines, and it is also called skip counting by 4009.

How to count by 4009
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 4009, we count 4009, 8018, 12027, 16036, and so on.

In other words, to count in intervals of 4009 or skip counting by 4009, we start with 4009 and then add 4009 to get the next number, and then continue adding 4009 to the previous number to keep counting by 4009, like this:

4009
4009 + 4009 = 8018
8018 + 4009 = 12027
12027 + 4009 = 16036
16036 + 4009 = 20045
...

You can of course skip count by 4009 forever, so it is impossible to make a list of all numbers, but below is a Count by 4009 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 4009, the second column has the next ten numbers you get when you skip count by 4009, and so forth.

Count by 4009 Patterns
We organized the Skip Counting by 4009s 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 4009, but don't have the Counting by 4009s Chart above. Obviously, one pattern with counting by 4009s is that the number increases by 4009.

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 10 over and over. The pattern of the last digit when you count by 4009 goes 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 and 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 and so on for as long as you count by 4009.

Why Count by 4009?
We think that understanding and learning about skip counting by 4009 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by four thousand nine, you are also creating a list of multiples of 4009 that you can use in math when you need the least common multiple. 4009 times n equals the nth multiple or skip count of 4009.

When you skip count by 4009, you are also creating a list of numbers that 4009 is divisible by. On top of that, skip counting by 4009 is the same as making the 4009 times table.

Skip Counting
Need to skip count by another number? Enter another number for us to skip count for you.

Count by 4010
Here is the next number on our list that we used to skip count.