The article has 24 questions on “Logical Reasoning / Number Series Questions and Answers” series where you will different number series followed by some number is getting added or subtracted and this is how a series is formed you have to identify the missing number in the series.

Such questions comes in CAT, UPSC Prelims, Bank PO, RBI and other such competitive exams – so this article will help you in improving your skills in solving such kind of questions.

**Other Similar Articles:**

**Odd Man out: **Part – I | Part II.

## Table of Contents

*God built the universe on numbers.– Pythagoras*

**Questions Section**

**Q1. Find the next number in the series is: **

**592, 586, 580, 574, ??, 562**

Ans: 568 i.e. 574 – 6 = 568

592, 592 – 6 = 586, 586 – 6 = 580, 580 – 6 = 580, 580 – 6 = 574, and so on.**Logic:** Every number is previous number minus 6 and that is how the middle number or the number at 5th position will be identified.

**Q2. Find the next number in the series is: **

**-168, -155, -142, -129, ??, -103**

Ans: -116 i.e. -129 + 13 = -116

-168, -168 + 13 = -155, -155 + 13 = -142, -142 + 13 = -142, -142 + 13 = -129, and so on.

Logic: Every number is previous number plus 13 and that is how you can find out the number at 5th position.

**Q3. Find the next number in the series is: **

**-816, -827, -838, -849, ??**

Ans: -860 i.e. -849 – 11 = -860

-816, -816 – 11 = -827, -827 – 11 = -838, -838 – 11 = -838, -838 – 11 = -849, and so on.

Logic: Every number is previous number minus 11 and that is how you can identify the last number in the series.

**Q4. Find the next number in the series is: **

**640, 656, 672, 688, ??**

Ans: 704 i.e. 688 + 16 = 704

640, 640 + 16 = 656, 656 + 16 = 672, 672 + 16 = 672, 672 + 16 = 688, and so on.

Logic: Every number is previous number plus 16 and that is how you can find out the last number in the series.

**Q5. Find the next number in the series is: **

**362, 345, 328, 311, ??, 277**

Ans: 294 i.e. 311 – 17 = 294

362, 362 – 17 = 345, 345 – 17 = 328, 328 – 17 = 328, 328 – 17 = 311, and so on.

Logic: Every number is previous number minus 17 and that is how the middle number or the number at 5th position will be identified.

**Q6. Find the next number in the series is: **

**-910, -903, -896, -889, ??, -875**

Ans: -882 i.e. -889 + 7 = -882

-910, -910 + 7 = -903, -903 + 7 = -896, -896 + 7 = -896, -896 + 7 = -889, and so on.

Logic: Every number is previous number plus 7 and that is how you can find out the number at 5th position.

**Q7. Find the next number in the series is: **

**-168, -177, -186, -195, ??**

Ans: -204 i.e. -195 – 9 = -204

-168, -168 – 9 = -177, -177 – 9 = -186, -186 – 9 = -186, -186 – 9 = -195, and so on.

Logic: Every number is previous number minus 9 and that is how you can identify the last number in the series.

**Q8. Find the next number in the series is: **

**270, 276, 282, 288, ??**

Ans: 294 i.e. 288 + 6 = 294

270, 270 + 6 = 276, 276 + 6 = 282, 282 + 6 = 282, 282 + 6 = 288, and so on.

Logic: Every number is previous number plus 6 and that is how you can find out the last number in the series.

**Q9. Find the next number in the series is: **

**240, 230, 220, 210, ??, 190**

Ans: 200 i.e. 210 – 10 = 200

240, 240 – 10 = 230, 230 – 10 = 220, 220 – 10 = 220, 220 – 10 = 210, and so on.

Logic: Every number is previous number minus 10 and that is how the middle number or the number at 5th position will be identified.

**Q10. Find the next number in the series is: **

**-520, -503, -486, -469, ??, -435**

Ans: -452 i.e. -469 + 17 = -452

-520, -520 + 17 = -503, -503 + 17 = -486, -486 + 17 = -486, -486 + 17 = -469, and so on.

Logic: Every number is previous number plus 17 and that is how you can find out the number at 5th position.

**Q11. Find the next number in the series is: **

**-972, -977, -982, -987, ??**

Ans: -992 i.e. -987 – 5 = -992

-972, -972 – 5 = -977, -977 – 5 = -982, -982 – 5 = -982, -982 – 5 = -987, and so on.

Logic: Every number is previous number minus 5 and that is how you can identify the last number in the series.

**Q12. Find the next number in the series is: **

**504, 522, 540, 558, ??**

Ans: 576 i.e. 558 + 18 = 576

504, 504 + 18 = 522, 522 + 18 = 540, 540 + 18 = 540, 540 + 18 = 558, and so on.

Logic: Every number is previous number plus 18 and that is how you can find out the last number in the series.

**Q13. Find the next number in the series is: **

**242, 224, 206, 188, ??, 152**

Ans: 170 i.e. 188 – 18 = 170

242, 242 – 18 = 224, 224 – 18 = 206, 206 – 18 = 206, 206 – 18 = 188, and so on.

Logic: Every number is previous number minus 18 and that is how the middle number or the number at 5th position will be identified.

**Q14. Find the next number in the series is: **

**-238, -236, -234, -232, ??, -228**

Ans: -230 i.e. -232 + 2 = -230

-238, -238 + 2 = -236, -236 + 2 = -234, -234 + 2 = -234, -234 + 2 = -232, and so on.

Logic: Every number is previous number plus 2 and that is how you can find out the number at 5th position.

**Q15. Find the next number in the series is: **

**-578, -584, -590, -596, ??**

Ans: -602 i.e. -596 – 6 = -602

-578, -578 – 6 = -584, -584 – 6 = -590, -590 – 6 = -590, -590 – 6 = -596, and so on.

Logic: Every number is previous number minus 6 and that is how you can identify the last number in the series.

**Q16. Find the next number in the series is: **

**944, 955, 966, 977, ??**

Ans: 988 i.e. 977 + 11 = 988

944, 944 + 11 = 955, 955 + 11 = 966, 966 + 11 = 966, 966 + 11 = 977, and so on.

Logic: Every number is previous number plus 11 and that is how you can find out the last number in the series.

**Q17. Find the next number in the series is: **

**358, 353, 348, 343, ??, 333**

Ans: 338 i.e. 343 – 5 = 338

358, 358 – 5 = 353, 353 – 5 = 348, 348 – 5 = 348, 348 – 5 = 343, and so on.

Logic: Every number is previous number minus 5 and that is how the middle number or the number at 5th position will be identified.

**Q18. Find the next number in the series is: **

**-592, -589, -586, -583, ??, -577**

Ans: -580 i.e. -583 + 3 = -580

-592, -592 + 3 = -589, -589 + 3 = -586, -586 + 3 = -586, -586 + 3 = -583, and so on.

Logic: Every number is previous number plus 3 and that is how you can find out the number at 5th position.

**Q19. Find the next number in the series is: –**

**954, -970, -986, -1002, ??**

Ans: -1018 i.e. -1002 – 16 = -1018

-954, -954 – 16 = -970, -970 – 16 = -986, -986 – 16 = -986, -986 – 16 = -1002, and so on.

Logic: Every number is previous number minus 16 and that is how you can identify the last number in the series.

**Q20. Find the next number in the series is: **

**550, 560, 570, 580, ??**

Ans: 590 i.e. 580 + 10 = 590

550, 550 + 10 = 560, 560 + 10 = 570, 570 + 10 = 570, 570 + 10 = 580, and so on.

Logic: Every number is previous number plus 10 and that is how you can find out the last number in the series.

**Q21. Find the next number in the series is: **

**968, 958, 948, 938, ??, 918**

Ans: 928 i.e. 938 – 10 = 928

968, 968 – 10 = 958, 958 – 10 = 948, 948 – 10 = 948, 948 – 10 = 938, and so on.

Logic: Every number is previous number minus 10 and that is how the middle number or the number at 5th position will be identified.

**Q22. Find the next number in the series is: **

**-424, -412, -400, -388, ??, -364**

Ans: -376 i.e. -388 + 12 = -376

-424, -424 + 12 = -412, -412 + 12 = -400, -400 + 12 = -400, -400 + 12 = -388, and so on.

Logic: Every number is previous number plus 12 and that is how you can find out the number at 5th position.

**Q23. Find the next number in the series is: **

**-744, -745, -746, -747, ??**

Ans: -748 i.e. -747 – 1 = -748

-744, -744 – 1 = -745, -745 – 1 = -746, -746 – 1 = -746, -746 – 1 = -747, and so on.

Logic: Every number is previous number minus 1 and that is how you can identify the last number in the series.

**Q24. Find the next number in the series is: **

**720, 739, 758, 777, ??**

Ans: 796 i.e. 777 + 19 = 796

720, 720 + 19 = 739, 739 + 19 = 758, 758 + 19 = 758, 758 + 19 = 777, and so on.

Logic: Every number is previous number plus 19 and that is how you can find out the last number in the series.

**Other relevant articles:**

- Number Series Questions and Answers – I
- Number Series Questions and Answers – II
- Logical Reasoning / Number Series Questions and Answers – III

**Conclusion**

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