Count by 420
Here we will show you how to count by 420, discuss counting by 420 patterns, and tell you why knowing how to count by 420 matters. To start off, note that Count by 420 means counting in 420s, or count by four hundred twenties, and it is also called skip counting by 420.
How to count by 420
Normally, we would count by 1 like this: 1, 2, 3, 4, etc., but when we count by 420, we count 420, 840, 1260, 1680, and so on.
In other words, to count in intervals of 420 or skip counting by 420, we start with 420 and then add 420 to get the next number, and then continue adding 420 to the previous number to keep counting by 420, like this:
420
420 + 420 = 840
840 + 420 = 1260
1260 + 420 = 1680
1680 + 420 = 2100
...
You can of course skip count by 420 forever, so it is impossible to make a list of all numbers, but below is a Count by 420 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 420, the second column has the next ten numbers you get when you skip count by 420, and so forth.
Count by 420 Patterns
We organized the Skip Counting by 420s 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 420, but don't have the Counting by 420s Chart above. Obviously, one pattern with counting by 420s is that the number increases by 420.
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 420 goes 0 and 0 and so on for as long as you count by 420.
Why Count by 420?
We think that understanding and learning about skip counting by 420 is important, because it teaches you how the arithmetic operations fit together. Below are some examples of what we mean.
When you count by four hundred twenty, you are also creating a list of multiples of 420 that you can use in math when you need the least common multiple. 420 times n equals the nth multiple or skip count of 420.
When you skip count by 420, you are also creating a list of numbers that 420 is divisible by. On top of that, skip counting by 420 is the same as making the 420 times table.
Skip Counting
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Count by 421
Here is the next number on our list that we used to skip count.
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