Count by 990 (Skip Counting by 990s)

Count by 990

Here we will show you how to count by 990, discuss counting by 990 patterns, and tell you why knowing how to count by 990 matters. To start off, note that Count by 990 means counting in 990s, or count by nine hundred nineties, and it is also called skip counting by 990.

How to count by 990
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 990, we count 990, 1980, 2970, 3960, and so on.

In other words, to count in intervals of 990 or skip counting by 990, we start with 990 and then add 990 to get the next number, and then continue adding 990 to the previous number to keep counting by 990, like this:

990
990 + 990 = 1980
1980 + 990 = 2970
2970 + 990 = 3960
3960 + 990 = 4950
...

You can of course skip count by 990 forever, so it is impossible to make a list of all numbers, but below is a Count by 990 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 990, the second column has the next ten numbers you get when you skip count by 990, and so forth.

Count by 990 Patterns
We organized the Skip Counting by 990s 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 990, but don't have the Counting by 990s Chart above. Obviously, one pattern with counting by 990s is that the number increases by 990.

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 1 over and over. The pattern of the last digit when you count by 990 goes 0 and 0 and so on for as long as you count by 990.

Why Count by 990?
We think that understanding and learning about skip counting by 990 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 hundred ninety, you are also creating a list of multiples of 990 that you can use in math when you need the least common multiple. 990 times n equals the nth multiple or skip count of 990.

When you skip count by 990, you are also creating a list of numbers that 990 is divisible by. On top of that, skip counting by 990 is the same as making the 990 times table.

Skip Counting
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Count by 991
Here is the next number on our list that we used to skip count.