Count by 661 (Skip Counting by 661s)

Count by 661

Here we will show you how to count by 661, discuss counting by 661 patterns, and tell you why knowing how to count by 661 matters. To start off, note that Count by 661 means counting in 661s, or count by six hundred sixty-ones, and it is also called skip counting by 661.

How to count by 661
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 661, we count 661, 1322, 1983, 2644, and so on.

In other words, to count in intervals of 661 or skip counting by 661, we start with 661 and then add 661 to get the next number, and then continue adding 661 to the previous number to keep counting by 661, like this:

661
661 + 661 = 1322
1322 + 661 = 1983
1983 + 661 = 2644
2644 + 661 = 3305
...

You can of course skip count by 661 forever, so it is impossible to make a list of all numbers, but below is a Count by 661 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 661, the second column has the next ten numbers you get when you skip count by 661, and so forth.

Count by 661 Patterns
We organized the Skip Counting by 661s 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 661, but don't have the Counting by 661s Chart above. Obviously, one pattern with counting by 661s is that the number increases by 661.

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 661 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 661.

Why Count by 661?
We think that understanding and learning about skip counting by 661 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-one, you are also creating a list of multiples of 661 that you can use in math when you need the least common multiple. 661 times n equals the nth multiple or skip count of 661.

When you skip count by 661, you are also creating a list of numbers that 661 is divisible by. On top of that, skip counting by 661 is the same as making the 661 times table.

Skip Counting
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Count by 662
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