Count by 640 (Skip Counting by 640s)

Count by 640

Here we will show you how to count by 640, discuss counting by 640 patterns, and tell you why knowing how to count by 640 matters. To start off, note that Count by 640 means counting in 640s, or count by six hundred forties, and it is also called skip counting by 640.

How to count by 640
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 640, we count 640, 1280, 1920, 2560, and so on.

In other words, to count in intervals of 640 or skip counting by 640, we start with 640 and then add 640 to get the next number, and then continue adding 640 to the previous number to keep counting by 640, like this:

640
640 + 640 = 1280
1280 + 640 = 1920
1920 + 640 = 2560
2560 + 640 = 3200
...

You can of course skip count by 640 forever, so it is impossible to make a list of all numbers, but below is a Count by 640 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 640, the second column has the next ten numbers you get when you skip count by 640, and so forth.

Count by 640 Patterns
We organized the Skip Counting by 640s 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 640, but don't have the Counting by 640s Chart above. Obviously, one pattern with counting by 640s is that the number increases by 640.

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 640 goes 0 and 0 and so on for as long as you count by 640.

Why Count by 640?
We think that understanding and learning about skip counting by 640 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.

When you count by six hundred forty, you are also creating a list of multiples of 640 that you can use in math when you need the least common multiple. 640 times n equals the nth multiple or skip count of 640.

When you skip count by 640, you are also creating a list of numbers that 640 is divisible by. On top of that, skip counting by 640 is the same as making the 640 times table.

Skip Counting
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Count by 641
Here is the next number on our list that we used to skip count.