Count by 399 (Skip Counting by 399s)

Count by 399

Here we will show you how to count by 399, discuss counting by 399 patterns, and tell you why knowing how to count by 399 matters. To start off, note that Count by 399 means counting in 399s, or count by three hundred ninety-nines, and it is also called skip counting by 399.

How to count by 399
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 399, we count 399, 798, 1197, 1596, and so on.

In other words, to count in intervals of 399 or skip counting by 399, we start with 399 and then add 399 to get the next number, and then continue adding 399 to the previous number to keep counting by 399, like this:

399
399 + 399 = 798
798 + 399 = 1197
1197 + 399 = 1596
1596 + 399 = 1995
...

You can of course skip count by 399 forever, so it is impossible to make a list of all numbers, but below is a Count by 399 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 399, the second column has the next ten numbers you get when you skip count by 399, and so forth.

Count by 399 Patterns
We organized the Skip Counting by 399s 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 399, but don't have the Counting by 399s Chart above. Obviously, one pattern with counting by 399s is that the number increases by 399.

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 399 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 399.

Why Count by 399?
We think that understanding and learning about skip counting by 399 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 ninety-nine, you are also creating a list of multiples of 399 that you can use in math when you need the least common multiple. 399 times n equals the nth multiple or skip count of 399.

When you skip count by 399, you are also creating a list of numbers that 399 is divisible by. On top of that, skip counting by 399 is the same as making the 399 times table.

Skip Counting
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Count by 400
Here is the next number on our list that we used to skip count.