# predecessor, successor and skip counting

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Consider the number, 132
what is the number that comes just before 132?
Yes, it is 131
Now, what is the number
that comes just after 132?
It is very easy.
It is 133.
Here 131,
is the predecessor
of
132.
And
133
is the successor of 132.
So,
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Let us look at some examples,
Consider a 4 digit number,
2376
It's predecessor is
2376 - 1
i.e., equal to 2375
The successor of 2376
is
2376 + 1
i.e., 2377
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Look at this number line,
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Consider the number 15,
The number just on the left of it
is 14.
So, the number 14 comes before the number 15.
And the number just on the right of 15
is 16.
So, the number 16 comes after number 15.
So, I can say that the number
before any number
can be obtained by subtracting
one from it
and the number after any number
can be obtained
by adding one to it.
Here, 14 is obtained
by subtracting 1 from 15
and 16 is obtained by adding
1 to 15.
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Let me take this number line.
In skip counting,
in 4s starting form 0
I have to jump 4 times,
like this,
Now, I am at 4.
Next, the same procedure will be followed,
like this,
So, we can lift the marked numbers
as 0
4,
8,
12,
and so on.
See,
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