Count by 121 (Skip Counting by 121s)

Count by 121

Here we will show you how to count by 121, discuss counting by 121 patterns, and tell you why knowing how to count by 121 matters. To start off, note that Count by 121 means counting in 121s, or count by one hundred twenty-ones, and it is also called skip counting by 121.

How to count by 121
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 121, we count 121, 242, 363, 484, and so on.

In other words, to count in intervals of 121 or skip counting by 121, we start with 121 and then add 121 to get the next number, and then continue adding 121 to the previous number to keep counting by 121, like this:

121
121 + 121 = 242
242 + 121 = 363
363 + 121 = 484
484 + 121 = 605
...

You can of course skip count by 121 forever, so it is impossible to make a list of all numbers, but below is a Count by 121 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 121, the second column has the next ten numbers you get when you skip count by 121, and so forth.

Count by 121 Patterns
We organized the Skip Counting by 121s 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 121, but don't have the Counting by 121s Chart above. Obviously, one pattern with counting by 121s is that the number increases by 121.

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 121 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 121.

Why Count by 121?
We think that understanding and learning about skip counting by 121 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by one hundred twenty-one, you are also creating a list of multiples of 121 that you can use in math when you need the least common multiple. 121 times n equals the nth multiple or skip count of 121.

When you skip count by 121, you are also creating a list of numbers that 121 is divisible by. On top of that, skip counting by 121 is the same as making the 121 times table.

Skip Counting
Need to skip count by another number? Enter another number for us to skip count for you.

Count by 122
Here is the next number on our list that we used to skip count.