Count by 309 (Skip Counting by 309s)

Count by 309

Here we will show you how to count by 309, discuss counting by 309 patterns, and tell you why knowing how to count by 309 matters. To start off, note that Count by 309 means counting in 309s, or count by three hundred nines, and it is also called skip counting by 309.

How to count by 309
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 309, we count 309, 618, 927, 1236, and so on.

In other words, to count in intervals of 309 or skip counting by 309, we start with 309 and then add 309 to get the next number, and then continue adding 309 to the previous number to keep counting by 309, like this:

309
309 + 309 = 618
618 + 309 = 927
927 + 309 = 1236
1236 + 309 = 1545
...

You can of course skip count by 309 forever, so it is impossible to make a list of all numbers, but below is a Count by 309 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 309, the second column has the next ten numbers you get when you skip count by 309, and so forth.

Count by 309 Patterns
We organized the Skip Counting by 309s 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 309, but don't have the Counting by 309s Chart above. Obviously, one pattern with counting by 309s is that the number increases by 309.

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 309 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 309.

Why Count by 309?
We think that understanding and learning about skip counting by 309 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by three hundred nine, you are also creating a list of multiples of 309 that you can use in math when you need the least common multiple. 309 times n equals the nth multiple or skip count of 309.

When you skip count by 309, you are also creating a list of numbers that 309 is divisible by. On top of that, skip counting by 309 is the same as making the 309 times table.

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

Count by 310
Here is the next number on our list that we used to skip count.