# Logical Reasoning / Number Series Questions and Answers – V

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.

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Odd Man out: Part – I | Part II.

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.

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