Count by 665 (Skip Counting by 665s)

Count by 665

Here we will show you how to count by 665, discuss counting by 665 patterns, and tell you why knowing how to count by 665 matters. To start off, note that Count by 665 means counting in 665s, or count by six hundred sixty-fives, and it is also called skip counting by 665.

How to count by 665
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 665, we count 665, 1330, 1995, 2660, and so on.

In other words, to count in intervals of 665 or skip counting by 665, we start with 665 and then add 665 to get the next number, and then continue adding 665 to the previous number to keep counting by 665, like this:

665
665 + 665 = 1330
1330 + 665 = 1995
1995 + 665 = 2660
2660 + 665 = 3325
...

You can of course skip count by 665 forever, so it is impossible to make a list of all numbers, but below is a Count by 665 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 665, the second column has the next ten numbers you get when you skip count by 665, and so forth.

Count by 665 Patterns
We organized the Skip Counting by 665s 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 665, but don't have the Counting by 665s Chart above. Obviously, one pattern with counting by 665s is that the number increases by 665.

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 2 over and over. The pattern of the last digit when you count by 665 goes 5, 0 and 5, 0 and so on for as long as you count by 665.

Why Count by 665?
We think that understanding and learning about skip counting by 665 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 sixty-five, you are also creating a list of multiples of 665 that you can use in math when you need the least common multiple. 665 times n equals the nth multiple or skip count of 665.

When you skip count by 665, you are also creating a list of numbers that 665 is divisible by. On top of that, skip counting by 665 is the same as making the 665 times table.

Skip Counting
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Count by 666
Here is the next number on our list that we used to skip count.