Count by 123 (Skip Counting by 123s)

Count by 123

Here we will show you how to count by 123, discuss counting by 123 patterns, and tell you why knowing how to count by 123 matters. To start off, note that Count by 123 means counting in 123s, or count by one hundred twenty-threes, and it is also called skip counting by 123.

How to count by 123
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 123, we count 123, 246, 369, 492, and so on.

In other words, to count in intervals of 123 or skip counting by 123, we start with 123 and then add 123 to get the next number, and then continue adding 123 to the previous number to keep counting by 123, like this:

123
123 + 123 = 246
246 + 123 = 369
369 + 123 = 492
492 + 123 = 615
...

You can of course skip count by 123 forever, so it is impossible to make a list of all numbers, but below is a Count by 123 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 123, the second column has the next ten numbers you get when you skip count by 123, and so forth.

Count by 123 Patterns
We organized the Skip Counting by 123s 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 123, but don't have the Counting by 123s Chart above. Obviously, one pattern with counting by 123s is that the number increases by 123.

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 123 goes 3, 6, 9, 2, 5, 8, 1, 4, 7, 0 and 3, 6, 9, 2, 5, 8, 1, 4, 7, 0 and so on for as long as you count by 123.

Why Count by 123?
We think that understanding and learning about skip counting by 123 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 hundred twenty-three, you are also creating a list of multiples of 123 that you can use in math when you need the least common multiple. 123 times n equals the nth multiple or skip count of 123.

When you skip count by 123, you are also creating a list of numbers that 123 is divisible by. On top of that, skip counting by 123 is the same as making the 123 times table.

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

Count by 124
Here is the next number on our list that we used to skip count.