Count by 40 (Skip Counting by 40s)

Count by 40

Here we will show you how to count by 40, discuss counting by 40 patterns, and tell you why knowing how to count by 40 matters. To start off, note that Count by 40 means counting in 40s, or count by forties, and it is also called skip counting by 40.

How to count by 40
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 40, we count 40, 80, 120, 160, and so on.

In other words, to count in intervals of 40 or skip counting by 40, we start with 40 and then add 40 to get the next number, and then continue adding 40 to the previous number to keep counting by 40, like this:

40
40 + 40 = 80
80 + 40 = 120
120 + 40 = 160
160 + 40 = 200
...

You can of course skip count by 40 forever, so it is impossible to make a list of all numbers, but below is a Count by 40 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 40, the second column has the next ten numbers you get when you skip count by 40, and so forth.

Count by 40 Patterns
We organized the Skip Counting by 40s 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 40, but don't have the Counting by 40s Chart above. Obviously, one pattern with counting by 40s is that the number increases by 40.

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 40 goes 0 and 0 and so on for as long as you count by 40.

Why Count by 40?
We think that understanding and learning about skip counting by 40 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by forty, you are also creating a list of multiples of 40 that you can use in math when you need the least common multiple. 40 times n equals the nth multiple or skip count of 40.

When you skip count by 40, you are also creating a list of numbers that 40 is divisible by. On top of that, skip counting by 40 is the same as making the 40 times table.

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

Count by 41
Here is the next number on our list that we used to skip count.