Count by 9901 (Skip Counting by 9901s)

Count by 9901

Here we will show you how to count by 9901, discuss counting by 9901 patterns, and tell you why knowing how to count by 9901 matters. To start off, note that Count by 9901 means counting in 9901s, or count by nine thousand nine hundred ones, and it is also called skip counting by 9901.

How to count by 9901
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 9901, we count 9901, 19802, 29703, 39604, and so on.

In other words, to count in intervals of 9901 or skip counting by 9901, we start with 9901 and then add 9901 to get the next number, and then continue adding 9901 to the previous number to keep counting by 9901, like this:

9901
9901 + 9901 = 19802
19802 + 9901 = 29703
29703 + 9901 = 39604
39604 + 9901 = 49505
...

You can of course skip count by 9901 forever, so it is impossible to make a list of all numbers, but below is a Count by 9901 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 9901, the second column has the next ten numbers you get when you skip count by 9901, and so forth.

Count by 9901 Patterns
We organized the Skip Counting by 9901s 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 9901, but don't have the Counting by 9901s Chart above. Obviously, one pattern with counting by 9901s is that the number increases by 9901.

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 9901 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 9901.

Why Count by 9901?
We think that understanding and learning about skip counting by 9901 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by nine thousand nine hundred one, you are also creating a list of multiples of 9901 that you can use in math when you need the least common multiple. 9901 times n equals the nth multiple or skip count of 9901.

When you skip count by 9901, you are also creating a list of numbers that 9901 is divisible by. On top of that, skip counting by 9901 is the same as making the 9901 times table.

Skip Counting
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Count by 9902
Here is the next number on our list that we used to skip count.