Directions:(1-5) Find the next term in the series.

1. 10, 15, 25, 35, 55, ?

Ans:5
The pattern 5 being multipled by consecutive prime numbers:

5 x 2 = 10

5 x 3 = 15

5 x 5 = 25

5 x 7 = 35

5 x 11 = 55

5 x 13 = 65

 

2. 19, 28, 39, 52, 67, ?

Ans:3
The pattern is as follows:

2 x 5 + 9 = 19

3 x 6 + 10 = 28

4 x 7 + 11 = 39

5 x 8 + 12 = 52

6 x 9 + 13 = 67

7 x 10 + 14 = 84

 

3. 265, 233, 203, 175, 149, ?

Ans:5
The pattern is as follows:

162 + 9 = 265

152 + 8 = 233

142 + 7 = 203

132 + 6 = 175

122 + 5 = 149

112 + 4 = 125

 

4. 727, 509, 339, 211, 119, ?

Ans:2
The pattern is as follows:

93 – 2 = 727

83 – 3 = 509

73 – 4 = 339

63 – 5 = 211

53 – 6 = 119

43 – 7 = 57

 

5. 7, 21, 49, 91, 147, ?

Ans:4
The pattern is as follows:

7 + 14 x 1 = 21

21 + 14 x 2 = 49

49 + 14 x 3 = 91

91 + 14 x 4 = 147

147 + 14 x 5 = 217

 

Directions:(6-10) Find the wrong term in the series given below.

6. 43, 55, 85, 143, 273, 455

Ans:4
The pattern adds the number to product of a prime number and the number following it:

43 + 3 x 4 = 55

55 + 5 x 6 = 85

85 + 7 x 8 = 141

141 + 11 x 12 = 273

273 + 13 x 14 = 455

 

7. 92, 112, 134, 158, 186

Ans:1
The pattern is as follows:

92 + 11 = 92

102 + 12 = 112

112 + 13 = 134

122 + 14 = 158

132 + 15 = 184

 

8. 113, 116, 122, 126, 140, 162

Ans:2
The series adds the product of the digits to the previous number:

113 + 3 = 116

116 + 6 = 122

122 + 4 = 126

126 + 12 = 138

138 + 24 = 162

 

9. 12585, 4229, 1425, 483, 165, 57

Ans:4
The pattern is shown below:

12585/3 + 25 = 4227

4227/3 + 24 = 1425

1425/3 + 23 = 483

483/3 + 22 = 165

165/3 + 21 = 57

 

10. 3.2, 6.3, 8.4, 10.0, 11.6

Ans:5
The pattern is shown below:

√10= 3.2

√40= 6.3

√70= 8.4

√100= 10.0

√130= 11.4

Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

133 thoughts on “Number Series”

  5. Marcos

    You actually make it seem really easy with your presentation but I find this topic to be actually
    one thing which I believe I’d never understand. It seems
    too complicated and very vast for me. I’m looking ahead
    for your subsequent submit, I’ll attempt to get the cling of it!
    Lista escape roomów

  9. Apolonia Ege

    Hello I am so grateful I found your website, I really found you by mistake, while I was browsing on Bing for something else, Anyhow I am here now and would just like to say thanks for a remarkable post and a all round interesting blog (I also love the theme/design), I don’t have time to read it all at the minute but I have saved it and also included your RSS feeds, so when I have time I will be back to read more, Please do keep up the excellent work.

  60. Ngzadszk

    Explore the ranked best online casinos of 2025. Compare bonuses, game selections, and trustworthiness of top platforms for secure and rewarding gameplaycasino bonus.

  61. fliet

    Happy to join conversations, share experiences, and learn something new as I go.
    I like understanding different opinions and contributing whenever I can. Happy to hear different experiences and connecting with others.
    That’s my site-https://automisto24.com.ua/

  121. RichardGrart

    ¡Saludos, seguidores de la diversión !
    Mejores casinos online extranjeros 2025 en espaГ±ol – п»їhttps://casinosextranjerosenespana.es/ casinos extranjeros
    ¡Que vivas increíbles victorias épicas !

  126. Oscardon

    ¡Saludos, estrategas del desafío !
    Mejores promociones en casinos fuera de EspaГ±a – п»їhttps://casinosonlinefueraespanol.xyz/ casino online fuera de espaГ±a
    ¡Que disfrutes de triunfos épicos !

  129. Douglasvok

    ¡Hola, descubridores de oportunidades únicas!
    Casinos fuera de EspaГ±a para mГіvil y escritorio – п»їhttps://casinosonlinefueradeespanol.xyz/ casino por fuera
    ¡Que disfrutes de asombrosas rondas vibrantes !

  132. Franktug

    ¡Hola, exploradores de oportunidades !
    Casino sin licencia espaГ±ola que acepta Ethereum – п»їhttps://casinosinlicenciaespana.xyz/ casino sin licencia espaГ±a
    ¡Que vivas increíbles instantes únicos !

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top