Count by 221 (Skip Counting by 221s)

Count by 221

Here we will show you how to count by 221, discuss counting by 221 patterns, and tell you why knowing how to count by 221 matters. To start off, note that Count by 221 means counting in 221s, or count by two hundred twenty-ones, and it is also called skip counting by 221.

How to count by 221
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 221, we count 221, 442, 663, 884, and so on.

In other words, to count in intervals of 221 or skip counting by 221, we start with 221 and then add 221 to get the next number, and then continue adding 221 to the previous number to keep counting by 221, like this:

221
221 + 221 = 442
442 + 221 = 663
663 + 221 = 884
884 + 221 = 1105
...

You can of course skip count by 221 forever, so it is impossible to make a list of all numbers, but below is a Count by 221 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 221, the second column has the next ten numbers you get when you skip count by 221, and so forth.

Count by 221 Patterns
We organized the Skip Counting by 221s 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 221, but don't have the Counting by 221s Chart above. Obviously, one pattern with counting by 221s is that the number increases by 221.

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 221 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 221.

Why Count by 221?
We think that understanding and learning about skip counting by 221 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 hundred twenty-one, you are also creating a list of multiples of 221 that you can use in math when you need the least common multiple. 221 times n equals the nth multiple or skip count of 221.

When you skip count by 221, you are also creating a list of numbers that 221 is divisible by. On top of that, skip counting by 221 is the same as making the 221 times table.

Skip Counting
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Count by 222
Here is the next number on our list that we used to skip count.