Problems on Number Series

Problems on Number Series

Learn and practice Problems on Number Series with easy explaination and shortcut tricks. All questions and answers on Number Series covered for various Competitive Exams

Solve Problems:

1) Which number should come next in the series, 48, 24, 12, ……?

  1. 8
  2. 6
  3. 4
  4. 2
View Answer

Answer: B

Explanation:

It is a simple division series in which each number is one-half of the previous number. We can also say that each number is divided by 2 to arrive at the next number;

On dividing 48 by 2, we get 24

On dividing 24 by 2, we get 12

So, on dividing 12 by 2, we will get 6 (option B).

2) Look at the series, 46, 44, 40, 38, 34, _, which number should come next?

  1. 30
  2. 36
  3. 32
  4. 31
View Answer

Answer: C

Explanation:

We can see that it is an alternating number subtraction series; first 2 is subtracted then 4 is subtracted and then 2 is subtracted again and so on;

46 – 2 = 44

44 – 4 = 40

40 – 2 = 38

38 – 4 = 34

34 – 2 = 32 (option C)

3) Which number would fill the empty space in the series; 4, 7, 12, 19, _, 39?

  1. 28
  2. 26
  3. 24
  4. 22
View Answer

Answer: A

Explanation:

In this series, the difference between the consecutive numbers increases by 2;

7 – 4 = 3
12 – 7 = 5
19 – 12 = 7

Therefore, the next number would be 19 + 9 = 28 (option A)

4) Which number would replace the underline mark in the series 20, 40, 100, _, 820?

  1. 240
  2. 260
  3. 280
  4. 300
View Answer

Answer: C

Explanation:

In this series, the difference between consecutive numbers is multiplied by 3; 20, 60, 180, 540.

Therefore, the missing number would be 100 + 180 = 280 (option C)

Try More:

5) What are the missing numbers in this series, 15, 20, 24, 15, 28, 32 15, _, _, 15?

  1. 37, 41
  2. 36, 40
  3. 38, 42
  4. 40, 44
View Answer

Answer: B

Explanation:

This is a simple addition series in which the number “15” is interpolated as every third number. And, except 15, four is added to each number to arrive at the next number.

6) Look at the series, 77, 70, 63, 56, 49, _, which number should come next?

  1. 42
  2. 46
  3. 44
  4. 48
View Answer

Answer: A

Explanation:

This is a simple subtraction series in which each number is 7 less than the previous number.

7) Look at the series; 41, 39, 35, 33, 29, _, which number should come next?

  1. 23
  2. 24
  3. 25
  4. 27
View Answer

Answer: D

Explanation:

This is a simple alternating subtraction series, which subtracts 2 then 4 and so on. Therefore, 27 (29 – 2) will come next.

8) Look at the series, 12, 24, 14, 28, 18, 36, __, which number should come next?

  1. 24
  2. 25
  3. 26
  4. 28
View Answer

Answer: C

Explanation:

This is an alternating multiplication and subtraction series; first multiply by 2 then subtract 10. Therefore, 26 (36 – 10) should come next.

Try to sove more Problems on Number Series.

9) Look at the series, 1536, 384, 96, _, which number should come next?

  1. 24
  2. 28
  3. 18
  4. 16
View Answer

Answer: A

Explanation:

This is a simple division series in which each number is divided by 4 to arrive at the next number. Therefore, 24 (96/4) would be the next number.

10) Find the missing number in the series; 1, 2, 3, 10 _.

  1. 89
  2. 99
  3. 79
  4. 69
View Answer

Answer: B

Explanation:

11 + 1= 2
22 – 1= 3
32 + 1= 10
102 – 1 = 99 (option B)

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