Count by 80 (Skip Counting by 80s)

Count by 80

Here we will show you how to count by 80, discuss counting by 80 patterns, and tell you why knowing how to count by 80 matters. To start off, note that Count by 80 means counting in 80s, or count by eighties, and it is also called skip counting by 80.

How to count by 80
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 80, we count 80, 160, 240, 320, and so on.

In other words, to count in intervals of 80 or skip counting by 80, we start with 80 and then add 80 to get the next number, and then continue adding 80 to the previous number to keep counting by 80, like this:

80
80 + 80 = 160
160 + 80 = 240
240 + 80 = 320
320 + 80 = 400
...

You can of course skip count by 80 forever, so it is impossible to make a list of all numbers, but below is a Count by 80 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 80, the second column has the next ten numbers you get when you skip count by 80, and so forth.

Count by 80 Patterns
We organized the Skip Counting by 80s 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 80, but don't have the Counting by 80s Chart above. Obviously, one pattern with counting by 80s is that the number increases by 80.

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 80 goes 0 and 0 and so on for as long as you count by 80.

Why Count by 80?
We think that understanding and learning about skip counting by 80 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by eighty, you are also creating a list of multiples of 80 that you can use in math when you need the least common multiple. 80 times n equals the nth multiple or skip count of 80.

When you skip count by 80, you are also creating a list of numbers that 80 is divisible by. On top of that, skip counting by 80 is the same as making the 80 times table.

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

Count by 81
Here is the next number on our list that we used to skip count.