Count by 2121 (Skip Counting by 2121s)

Count by 2121

Here we will show you how to count by 2121, discuss counting by 2121 patterns, and tell you why knowing how to count by 2121 matters. To start off, note that Count by 2121 means counting in 2121s, or count by two thousand one hundred twenty-ones, and it is also called skip counting by 2121.

How to count by 2121
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 2121, we count 2121, 4242, 6363, 8484, and so on.

In other words, to count in intervals of 2121 or skip counting by 2121, we start with 2121 and then add 2121 to get the next number, and then continue adding 2121 to the previous number to keep counting by 2121, like this:

2121
2121 + 2121 = 4242
4242 + 2121 = 6363
6363 + 2121 = 8484
8484 + 2121 = 10605
...

You can of course skip count by 2121 forever, so it is impossible to make a list of all numbers, but below is a Count by 2121 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 2121, the second column has the next ten numbers you get when you skip count by 2121, and so forth.

Count by 2121 Patterns
We organized the Skip Counting by 2121s 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 2121, but don't have the Counting by 2121s Chart above. Obviously, one pattern with counting by 2121s is that the number increases by 2121.

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 2121 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 2121.

Why Count by 2121?
We think that understanding and learning about skip counting by 2121 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by two thousand one hundred twenty-one, you are also creating a list of multiples of 2121 that you can use in math when you need the least common multiple. 2121 times n equals the nth multiple or skip count of 2121.

When you skip count by 2121, you are also creating a list of numbers that 2121 is divisible by. On top of that, skip counting by 2121 is the same as making the 2121 times table.

Skip Counting
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Count by 2122
Here is the next number on our list that we used to skip count.