Count by 9090 (Skip Counting by 9090s)

Count by 9090

Here we will show you how to count by 9090, discuss counting by 9090 patterns, and tell you why knowing how to count by 9090 matters. To start off, note that Count by 9090 means counting in 9090s, or count by nine thousand nineties, and it is also called skip counting by 9090.

How to count by 9090
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 9090, we count 9090, 18180, 27270, 36360, and so on.

In other words, to count in intervals of 9090 or skip counting by 9090, we start with 9090 and then add 9090 to get the next number, and then continue adding 9090 to the previous number to keep counting by 9090, like this:

9090
9090 + 9090 = 18180
18180 + 9090 = 27270
27270 + 9090 = 36360
36360 + 9090 = 45450
...

You can of course skip count by 9090 forever, so it is impossible to make a list of all numbers, but below is a Count by 9090 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 9090, the second column has the next ten numbers you get when you skip count by 9090, and so forth.

Count by 9090 Patterns
We organized the Skip Counting by 9090s 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 9090, but don't have the Counting by 9090s Chart above. Obviously, one pattern with counting by 9090s is that the number increases by 9090.

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 1 over and over. The pattern of the last digit when you count by 9090 goes 0 and 0 and so on for as long as you count by 9090.

Why Count by 9090?
We think that understanding and learning about skip counting by 9090 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 ninety, you are also creating a list of multiples of 9090 that you can use in math when you need the least common multiple. 9090 times n equals the nth multiple or skip count of 9090.

When you skip count by 9090, you are also creating a list of numbers that 9090 is divisible by. On top of that, skip counting by 9090 is the same as making the 9090 times table.

Skip Counting
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Count by 9091
Here is the next number on our list that we used to skip count.