Count by 321 (Skip Counting by 321s)

Count by 321

Here we will show you how to count by 321, discuss counting by 321 patterns, and tell you why knowing how to count by 321 matters. To start off, note that Count by 321 means counting in 321s, or count by three hundred twenty-ones, and it is also called skip counting by 321.

How to count by 321
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 321, we count 321, 642, 963, 1284, and so on.

In other words, to count in intervals of 321 or skip counting by 321, we start with 321 and then add 321 to get the next number, and then continue adding 321 to the previous number to keep counting by 321, like this:

321
321 + 321 = 642
642 + 321 = 963
963 + 321 = 1284
1284 + 321 = 1605
...

You can of course skip count by 321 forever, so it is impossible to make a list of all numbers, but below is a Count by 321 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 321, the second column has the next ten numbers you get when you skip count by 321, and so forth.

Count by 321 Patterns
We organized the Skip Counting by 321s 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 321, but don't have the Counting by 321s Chart above. Obviously, one pattern with counting by 321s is that the number increases by 321.

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 321 goes 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 and 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 and so on for as long as you count by 321.

Why Count by 321?
We think that understanding and learning about skip counting by 321 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 twenty-one, you are also creating a list of multiples of 321 that you can use in math when you need the least common multiple. 321 times n equals the nth multiple or skip count of 321.

When you skip count by 321, you are also creating a list of numbers that 321 is divisible by. On top of that, skip counting by 321 is the same as making the 321 times table.

Skip Counting
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Count by 322
Here is the next number on our list that we used to skip count.