Count by 129 (Skip Counting by 129s)

Count by 129

Here we will show you how to count by 129, discuss counting by 129 patterns, and tell you why knowing how to count by 129 matters. To start off, note that Count by 129 means counting in 129s, or count by one hundred twenty-nines, and it is also called skip counting by 129.

How to count by 129
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 129, we count 129, 258, 387, 516, and so on.

In other words, to count in intervals of 129 or skip counting by 129, we start with 129 and then add 129 to get the next number, and then continue adding 129 to the previous number to keep counting by 129, like this:

129
129 + 129 = 258
258 + 129 = 387
387 + 129 = 516
516 + 129 = 645
...

You can of course skip count by 129 forever, so it is impossible to make a list of all numbers, but below is a Count by 129 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 129, the second column has the next ten numbers you get when you skip count by 129, and so forth.

Count by 129 Patterns
We organized the Skip Counting by 129s 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 129, but don't have the Counting by 129s Chart above. Obviously, one pattern with counting by 129s is that the number increases by 129.

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 129 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 129.

Why Count by 129?
We think that understanding and learning about skip counting by 129 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-nine, you are also creating a list of multiples of 129 that you can use in math when you need the least common multiple. 129 times n equals the nth multiple or skip count of 129.

When you skip count by 129, you are also creating a list of numbers that 129 is divisible by. On top of that, skip counting by 129 is the same as making the 129 times table.

Skip Counting
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Count by 130
Here is the next number on our list that we used to skip count.