Logical reasoning number series
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1. The document provides 20 number series questions with multiple choice answers. It tests the ability to recognize patterns in numeric sequences and determine the next number in the series. 2. For each question, the number series is presented and the test taker must determine if the numbers are increasing or decreasing, and by what amount, to arrive at the next number. 3. An answer key is provided with explanations for the pattern in each series and the correct answer. The questions cover a variety of common numeric patterns like addition, subtraction, multiplication, and division series.
Logical reasoning number series
- 1. Logical Reasoning :: Number Series
- 2. In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
- 3. 1. Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?A.(1/3)B.(1/8)C.(2/8)D.(1/16)
- 4. 2. Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?A.7B.10C.12D.13
- 5. 3. Look at this series: 36, 34, 30, 28, 24, ... What number should come next?A.20B.22C.23D.26
- 6. 4. Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?A.22B.24C.25D.26
- 7. 5. Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?A.12B.14C.27D.53
- 8. 6. Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?A.14B.15C.21D.23
- 9. 7. Look at this series: 58, 52, 46, 40, 34, ... What number should come next?A.26B.28C.30D.32
- 10. 8. Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?A.7B.10C.14D.15
- 11. 9. Look at this series: 8, 22, 8, 28, 8, ... What number should come next?A.9B.29C.32D.34
- 12. 10. Look at this series: 31, 29, 24, 22, 17, ... What number should come next?A.15B.14C.13D.12
- 13. 11. Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?A.4.2B.4.4C.4.7D.5.1
- 14. 12. Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?A.52B.56C.96D.128
- 15. 13. Look at this series: 2, 4, 6, 8, 10, ... What number should come next?A.11B.12C.13D.14
- 16. 14. Look at this series: 201, 202, 204, 207, ... What number should come next?A.205B.208C.210D.211
- 17. 15. Look at this series: 544, 509, 474, 439, ... What number should come next?A.404B.414C.420D.445
- 18. 16. Look at this series: 80, 10, 70, 15, 60, ... What number should come next?A.20B.25C.30D.50
- 19. 17. Look at this series: 2, 6, 18, 54, ... What number should come next?A.108B.148C.162D.216
- 20. 18. Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?A.3B.3.3C.3.5D.3.6
- 21. 19. Look at this series: 1000, 200, 40, ... What number should come next?A.8B.10C.15D.20
- 22. 20. Look at this series: 40, 40, 47, 47, 54, ... What number should come next?A.40B.44C.54D.61
- 23. ANSWER KEY
- 24. 1. Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?B.(1/8)Answer: Option BExplanation:This is a simple division series; each number is one-half of the previous number.In other terms to say, the number is divided by 2 successively to get the next result.4/2 = 2 2/2 = 1 1/2 = 1/2 (1/2)/2 = 1/4 (1/4)/2 = 1/8 and so on.
- 25. 2. Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?B.10Answer: Option BExplanation:This is a simple alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted.
- 26. 3. Look at this series: 36, 34, 30, 28, 24, ... What number should come next?B.22Answer: Option BExplanation:This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.
- 27. 4. Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?C.25Answer: Option CExplanation:In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.
- 28. 5. Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?B.14Answer: Option BExplanation:In this series, each number is repeated, then 13 is subtracted to arrive at the next number.
- 29. 6. Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?B.15Answer: Option BExplanation:In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
- 30. 7. Look at this series: 58, 52, 46, 40, 34, ... What number should come next?B.28Answer: Option BExplanation:This is a simple subtraction series. Each number is 6 less than the previous number.
- 31. 8. Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?D.15Answer: Option DExplanation:This alternating addition series begins with 3; then 1 is added to give 4; then 3 is added to give 7; then 1 is added, and so on.
- 32. 9. Look at this series: 8, 22, 8, 28, 8, ... What number should come next?D.34Answer: Option DExplanation:This is a simple addition series with a random number, 8, interpolated as every other number. In the series, 6 is added to each number except 8, to arrive at the next number.
- 33. 10. Look at this series: 31, 29, 24, 22, 17, ... What number should come next?A.15Answer: Option AExplanation:This is a simple alternating subtraction series, which subtracts 2, then 5.
- 34. 11. Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?C.4.7Answer: Option CExplanation:In this simple addition series, each number increases by 0.8.
- 35. 12. Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?B.56Answer: Option BExplanation:This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
- 36. 13. Look at this series: 2, 4, 6, 8, 10, ... What number should come next?B.12Answer: Option BExplanation:This is a simple addition series. Each number increases by 2.
- 37. 14. Look at this series: 201, 202, 204, 207, ... What number should come next?D.211Answer: Option DExplanation:In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.
- 38. 15. Look at this series: 544, 509, 474, 439, ... What number should come next?A.404Answer: Option AExplanation:This is a simple subtraction series. Each number is 35 less than the previous number.
- 39. 16. Look at this series: 80, 10, 70, 15, 60, ... What number should come next?A.20Answer: Option AExplanation:This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
- 40. 17. Look at this series: 2, 6, 18, 54, ... What number should come next?C.162Answer: Option CExplanation:This is a simple multiplication series. Each number is 3 times more than the previous number.
- 41. 18. Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?D.3.6Answer: Option DExplanation:In this simple subtraction series, each number decreases by 0.4.
- 42. 19. Look at this series: 1000, 200, 40, ... What number should come next?A.8Answer: Option AExplanation:This is a simple division series. Each number is divided by 5.
- 43. 20. Look at this series: 40, 40, 47, 47, 54, ... What number should come next?C.54Answer: Option CExplanation:Each number repeats itself and then increases by 7.40, 40, 47, 47, 54, 54, 61, 61, 68, 68, 75, 75 ... and so on.54 is the required answer.
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