Count by 1209 (Skip Counting by 1209s)

Count by 1209

Here we will show you how to count by 1209, discuss counting by 1209 patterns, and tell you why knowing how to count by 1209 matters. To start off, note that Count by 1209 means counting in 1209s, or count by one thousand two hundred nines, and it is also called skip counting by 1209.

How to count by 1209
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 1209, we count 1209, 2418, 3627, 4836, and so on.

In other words, to count in intervals of 1209 or skip counting by 1209, we start with 1209 and then add 1209 to get the next number, and then continue adding 1209 to the previous number to keep counting by 1209, like this:

1209
1209 + 1209 = 2418
2418 + 1209 = 3627
3627 + 1209 = 4836
4836 + 1209 = 6045
...

You can of course skip count by 1209 forever, so it is impossible to make a list of all numbers, but below is a Count by 1209 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 1209, the second column has the next ten numbers you get when you skip count by 1209, and so forth.

Count by 1209 Patterns
We organized the Skip Counting by 1209s 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 1209, but don't have the Counting by 1209s Chart above. Obviously, one pattern with counting by 1209s is that the number increases by 1209.

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 1209 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 1209.

Why Count by 1209?
We think that understanding and learning about skip counting by 1209 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by one thousand two hundred nine, you are also creating a list of multiples of 1209 that you can use in math when you need the least common multiple. 1209 times n equals the nth multiple or skip count of 1209.

When you skip count by 1209, you are also creating a list of numbers that 1209 is divisible by. On top of that, skip counting by 1209 is the same as making the 1209 times table.

Skip Counting
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Count by 1210
Here is the next number on our list that we used to skip count.