Count by 9991 (Skip Counting by 9991s)

Count by 9991

Here we will show you how to count by 9991, discuss counting by 9991 patterns, and tell you why knowing how to count by 9991 matters. To start off, note that Count by 9991 means counting in 9991s, or count by nine thousand nine hundred ninety-ones, and it is also called skip counting by 9991.

How to count by 9991
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 9991, we count 9991, 19982, 29973, 39964, and so on.

In other words, to count in intervals of 9991 or skip counting by 9991, we start with 9991 and then add 9991 to get the next number, and then continue adding 9991 to the previous number to keep counting by 9991, like this:

9991
9991 + 9991 = 19982
19982 + 9991 = 29973
29973 + 9991 = 39964
39964 + 9991 = 49955
...

You can of course skip count by 9991 forever, so it is impossible to make a list of all numbers, but below is a Count by 9991 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 9991, the second column has the next ten numbers you get when you skip count by 9991, and so forth.

Count by 9991 Patterns
We organized the Skip Counting by 9991s 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 9991, but don't have the Counting by 9991s Chart above. Obviously, one pattern with counting by 9991s is that the number increases by 9991.

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 9991 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 9991.

Why Count by 9991?
We think that understanding and learning about skip counting by 9991 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 ninety-one, you are also creating a list of multiples of 9991 that you can use in math when you need the least common multiple. 9991 times n equals the nth multiple or skip count of 9991.

When you skip count by 9991, you are also creating a list of numbers that 9991 is divisible by. On top of that, skip counting by 9991 is the same as making the 9991 times table.

Skip Counting
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Count by 9992
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