The first number of the pattern is 14. The rule is add 25.

So, the second number in the pattern is 39.
Repeat this process two more times to find the third and fourth numbers in the pattern.

So, the first four numbers of a pattern with a starting number of 14 and a rule of add 25 are: 14 , 39 , 64 , 89.

The first number of the pattern is 100. The rule is subtract 15.

So, the second number in the pattern is 85.
Repeat this process two more times to find the third and fourth numbers in the pattern.

So, the first four numbers of a pattern with a starting number of 100 and a rule of subtract 15 are: 100 , 85 , 70 , 55.

One observation is that the numbers in the pattern end in 1.
This is because the rule of add 10 means that a 0 is added to the ones column of each number.
So, the digit in the ones column does not change.

A second observation is that the first digit of the numbers in the pattern increase by 1.
This is because the rule of add 10 means that a 1 is added to the tens column of each number.

Unlike the previous example, there are no immediate observations about the numbers in the pattern.

Sometimes observations can be made about the differences between numbers in a pattern.

8	-	4	=	4
16	-	8	=	8
32	-	16	=	16

Now, what observation can be made about the differences?
Notice that the differences are the same as the numbers in the given pattern.