Hello friends sharing an article on that has 24 Logical Reasoning / Number Series Questions and Answers that are simply based on addition and subtraction number series, which is being asked in various competitive exams be it for MBA, civil services, banks etc.

**Other similar articles:** Part – I | Part – II | Part– III | Part – IV | Part – V | Part – VI | Part – VII | Part – VIII | Part – IX | Part – X.

**Odd Man out: **Part – I | Part II.

*Pure mathematics is, in its way, the poetry of logical ideas.– Albert Einstein*

**Questions Section**

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

**134, 125, 116, 107, ??, 89**

Ans: 98 i.e. 107 – 9 = 98

134, 134 – 9 = 125, 125 – 9 = 116, 116 – 9 = 116, 116 – 9 = 107, and so on.

Logic: Every number is previous number minus 9 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: **

**-618, -599, -580, -561, ??, -523**

Ans: -542 i.e. -561 + 19 = -542

-618, -618 + 19 = -599, -599 + 19 = -580, -580 + 19 = -580, -580 + 19 = -561, and so on.

Logic: Every number is previous number plus 19 and that is how you can find out the number at 5th position.

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

**-594, -608, -622, -636, ??**

Ans: -650 i.e. -636 – 14 = -650

-594, -594 – 14 = -608, -608 – 14 = -622, -622 – 14 = -622, -622 – 14 = -636, and so on.

Logic: Every number is previous number minus 14 and that is how you can identify the last number in the series.

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

**416, 424, 432, 440, ??**

Ans: 448 i.e. 440 + 8 = 448

416, 416 + 8 = 424, 424 + 8 = 432, 432 + 8 = 432, 432 + 8 = 440, and so on.

Logic: Every number is previous number plus 8 and that is how you can find out the last number in the series.

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

**570, 567, 564, 561, ??, 555**

Ans: 558 i.e. 561 – 3 = 558

570, 570 – 3 = 567, 567 – 3 = 564, 564 – 3 = 564, 564 – 3 = 561, and so on.

Logic: Every number is previous number minus 3 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: **

**-530, -515, -500, -485, ??, -455**

Ans: -470 i.e. -485 + 15 = -470

-530, -530 + 15 = -515, -515 + 15 = -500, -500 + 15 = -500, -500 + 15 = -485, and so on.

Logic: Every number is previous number plus 15 and that is how you can find out the number at 5th position.

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

**-678, -696, -714, -732, ??**

Ans: -750 i.e. -732 – 18 = -750

-678, -678 – 18 = -696, -696 – 18 = -714, -714 – 18 = -714, -714 – 18 = -732, and so on.

Logic: Every number is previous number minus 18 and that is how you can identify the last number in the series.

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

**706, 714, 722, 730, ??**

Ans: 738 i.e. 730 + 8 = 738

706, 706 + 8 = 714, 714 + 8 = 722, 722 + 8 = 722, 722 + 8 = 730, and so on.

Logic: Every number is previous number plus 8 and that is how you can find out the last number in the series.

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

**254, 242, 230, 218, ??, 194**

Ans: 206 i.e. 218 – 12 = 206

254, 254 – 12 = 242, 242 – 12 = 230, 230 – 12 = 230, 230 – 12 = 218, and so on.

Logic: Every number is previous number minus 12 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: **

**-466, -449, -432, -415, ??, -381**

Ans: -398 i.e. -415 + 17 = -398

-466, -466 + 17 = -449, -449 + 17 = -432, -432 + 17 = -432, -432 + 17 = -415, 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: **

**-966, -968, -970, -972, ??**

Ans: -974 i.e. -972 – 2 = -974

-966, -966 – 2 = -968, -968 – 2 = -970, -970 – 2 = -970, -970 – 2 = -972, and so on.

Logic: Every number is previous number minus 2 and that is how you can identify the last number in the series.

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

**830, 834, 838, 842, ??**

Ans: 846 i.e. 842 + 4 = 846

830, 830 + 4 = 834, 834 + 4 = 838, 838 + 4 = 838, 838 + 4 = 842, and so on.

Logic: Every number is previous number plus 4 and that is how you can find out the last number in the series.

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

**590, 571, 552, 533, ??, 495**

Ans: 514 i.e. 533 – 19 = 514

590, 590 – 19 = 571, 571 – 19 = 552, 552 – 19 = 552, 552 – 19 = 533, and so on.

Logic: Every number is previous number minus 19 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: **

**-354, -337, -320, -303, ??, -269**

Ans: -286 i.e. -303 + 17 = -286

-354, -354 + 17 = -337, -337 + 17 = -320, -320 + 17 = -320, -320 + 17 = -303, and so on.

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

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

**-746, -759, -772, -785, ??**

Ans: -798 i.e. -785 – 13 = -798

-746, -746 – 13 = -759, -759 – 13 = -772, -772 – 13 = -772, -772 – 13 = -785, and so on.

Logic: Every number is previous number minus 13 and that is how you can identify the last number in the series.

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

**906, 919, 932, 945, ??**

Ans: 958 i.e. 945 + 13 = 958

906, 906 + 13 = 919, 919 + 13 = 932, 932 + 13 = 932, 932 + 13 = 945, and so on.

Logic: Every number is previous number plus 13 and that is how you can find out the last number in the series.

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

**562, 550, 538, 526, ??, 502**

Ans: 514 i.e. 526 – 12 = 514

562, 562 – 12 = 550, 550 – 12 = 538, 538 – 12 = 538, 538 – 12 = 526, and so on.

Logic: Every number is previous number minus 12 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: **

**-8, 1, 10, 19, ??, 37**

Ans: 28 i.e. 19 + 9 = 28

-8, -8 + 9 = 1, 1 + 9 = 10, 10 + 9 = 10, 10 + 9 = 19, and so on.

Logic: Every number is previous number plus 9 and that is how you can find out the number at 5th position.

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

**-656, -658, -660, -662, ??**

Ans: -664 i.e. -662 – 2 = -664

-656, -656 – 2 = -658, -658 – 2 = -660, -660 – 2 = -660, -660 – 2 = -662, and so on.

Logic: Every number is previous number minus 2 and that is how you can identify the last number in the series.

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

**552, 558, 564, 570, ??**

Ans: 576 i.e. 570 + 6 = 576

552, 552 + 6 = 558, 558 + 6 = 564, 564 + 6 = 564, 564 + 6 = 570, 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.

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

**396, 381, 366, 351, ??, 321**

Ans: 336 i.e. 351 – 15 = 336

396, 396 – 15 = 381, 381 – 15 = 366, 366 – 15 = 366, 366 – 15 = 351, and so on.

Logic: Every number is previous number minus 15 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: **

**-924, -907, -890, -873, ??, -839**

Ans: -856 i.e. -873 + 17 = -856

-924, -924 + 17 = -907, -907 + 17 = -890, -890 + 17 = -890, -890 + 17 = -873, and so on.

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

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

**-776, -794, -812, -830, ??**

Ans: -848 i.e. -830 – 18 = -848

-776, -776 – 18 = -794, -794 – 18 = -812, -812 – 18 = -812, -812 – 18 = -830, and so on.

Logic: Every number is previous number minus 18 and that is how you can identify the last number in the series.

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

**816, 820, 824, 828, ??**

Ans: 832 i.e. 828 + 4 = 832

816, 816 + 4 = 820, 820 + 4 = 824, 824 + 4 = 824, 824 + 4 = 828, and so on.

Logic: Every number is previous number plus 4 and that is how you can find out the last number in the series.

**Other relevant links:**

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

**Conclusion**

Hope this article will be of help to you readers – please let us know in case we need to improve anything or you want us to write on any other topic that can help you in anyway.

Thanks.

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