Count by 421 (Skip Counting by 421s)

Count by 421

Here we will show you how to count by 421, discuss counting by 421 patterns, and tell you why knowing how to count by 421 matters. To start off, note that Count by 421 means counting in 421s, or count by four hundred twenty-ones, and it is also called skip counting by 421.

How to count by 421
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 421, we count 421, 842, 1263, 1684, and so on.

In other words, to count in intervals of 421 or skip counting by 421, we start with 421 and then add 421 to get the next number, and then continue adding 421 to the previous number to keep counting by 421, like this:

421
421 + 421 = 842
842 + 421 = 1263
1263 + 421 = 1684
1684 + 421 = 2105
...

You can of course skip count by 421 forever, so it is impossible to make a list of all numbers, but below is a Count by 421 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 421, the second column has the next ten numbers you get when you skip count by 421, and so forth.

Count by 421 Patterns
We organized the Skip Counting by 421s 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 421, but don't have the Counting by 421s Chart above. Obviously, one pattern with counting by 421s is that the number increases by 421.

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 421 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 421.

Why Count by 421?
We think that understanding and learning about skip counting by 421 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by four hundred twenty-one, you are also creating a list of multiples of 421 that you can use in math when you need the least common multiple. 421 times n equals the nth multiple or skip count of 421.

When you skip count by 421, you are also creating a list of numbers that 421 is divisible by. On top of that, skip counting by 421 is the same as making the 421 times table.

Skip Counting
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Count by 422
Here is the next number on our list that we used to skip count.