Number series question answer are very frequently asked in the competitive examination so you must have to know how to solve number series reasoning and aptitude problem. The problem related to number series is must simpler and also toughest. If you know the tricks “how to solve number series reasoning and aptitude problem” then it will become a child play for you. But if you don’t know the tricks then this may acts like a headache for you.

So I am here giving you basic tricks to solve number series reasoning and aptitude problem. With these tricks you can easily solve these number series questions. So let’s start

Before attempting a number series problem make your mind free. Because if you will think about other things then it may take too much time. So be fresh and be concentrate to the problem

**Adding and subtracting a number**

**Adding in Forward direction:**

If you got a series in the examination like **12, 22, 32, 42, 52, ….. ?** . In this series you can easily visualize that here is a addition of 10 in each number.

12 + 10 = 22

22 + 10 = 32

32 + 10 = 42

42 + 10 = 52

So the last number will be 52 + 10 = 62

**Adding in backward direction or subtraction**

If you got a series in the examination like **98, 90, 82, 74, ……. ?** . In this type of problem you will easily visualize that here is addition of 8 from right to left or subtraction of 8 from left to right.

98 – 8 = 90

90 – 8 = 82

82 – 8 = 74

So the last number will be 74 – 8 = 66

Take another example **21,30,39,……,57,66**.

In this series you can see that there is an addition of 9 from left to right or subtraction of 9 from right to left.

**Complex adding in forward direction**

In some problem the adding of a single number may not complete the series. In this type of problem you have to think twice before solving and you have to find out the desired number pattern.

Take an example of** 0, 7, 15, ….. ,34, 45**

Now in this type of number series you will not easily get what number is adding or subtracting. So these problems called as complex adding and subtracting problem.

0 + 6 = 6 +1 = 7

7 + 6 = 13 +2 =15

**15 + 6 = 21 + 3 = 24**

24 + 6 = 30 + 4 = 34

34 + 6 = 40 + 5 = 45

**Addition and subtraction**

This problem may also be in subtraction like

**0, 5, 9, 12, …. , 15, 15** . These type of problem solve as

0 + 6 = 6 – 1 = 5

5 +6 = 11 – 2 = 9

9 + 6 = 15 – 3=12

**12 + 6 = 18- 4 = 14**

14 + 6 = 20 -5 = 15

15 + 6 = 21 – 6 = 15

You can easily solve these type of problem with these tricks.

In next tutorial we will discuss about the number series problem of multiplication and division. These type of problems are frequently asked in the examination. But before that attempt this **practice test on the addition and subtraction of number series**. After this you will get to know how much you got by this tutorial.

**Time to attempt Practice test **

## Number series addition and subtraction test

(*) All the best