Easy #1
A. 36
B. 5
C. 3
D. 4
Answer: D
Explanation:
Pattern rule: Divide each number by 3 Sequence: 324, 108, 36, 12, 4 Differences: -216, -72, -24, -8
Number Sequences Practice Questions with Answers
Practice with 30 sample questions organized by difficulty. Click “Show Answer” to reveal the correct answer and explanation.
Easy
Easy #2
A. 18
B. 35
C. 19
D. 20
Answer: C
Explanation:
Pattern rule: Subtract 8 from each number Sequence: 51, 43, 35, 27, 19 Differences: -8, -8, -8, -8
Easy #3
A. 5
B. 36
C. 4
D. 3
Answer: C
Explanation:
Pattern rule: Divide each number by 3 Sequence: 324, 108, 36, 12, 4 Differences: -216, -72, -24, -8
Easy #4
A. 53
B. 52
C. 54
D. 31
Answer: A
Explanation:
Pattern rule: Add 11 to each number Sequence: 9, 20, 31, 42, 53 Differences: +11, +11, +11, +11
Easy #5
A. 81
B. 30
C. 82
D. 80
Answer: A
Explanation:
Pattern rule: Multiply each number by 3 Sequence: 1, 3, 9, 27, 81 Differences: +2, +6, +18, +54
Easy #6
A. 405
B. 406
C. 404
D. 138
Answer: A
Explanation:
Pattern rule: Multiply each number by 3 Sequence: 5, 15, 45, 135, 405 Differences: +10, +30, +90, +270
Easy #7
A. 35
B. 25
C. 36
D. 34
Answer: A
Explanation:
Pattern rule: Add 5 to each number Sequence: 15, 20, 25, 30, 35 Differences: +5, +5, +5, +5
Easy #8
A. 3
B. 8
C. 1
D. 2
Answer: D
Explanation:
Pattern rule: Divide each number by 2 Sequence: 32, 16, 8, 4, 2 Differences: -16, -8, -4, -2
Easy #9
A. 43
B. 44
C. 45
D. 50
Answer: B
Explanation:
Pattern rule: Subtract 3 from each number Sequence: 56, 53, 50, 47, 44 Differences: -3, -3, -3, -3
Easy #10
A. 511
B. 132
C. 513
D. 512
Answer: D
Explanation:
Pattern rule: Multiply each number by 4 Sequence: 2, 8, 32, 128, 512 Differences: +6, +24, +96, +384
Medium
Medium #11
A. 47
B. 3
C. 2
D. 4
E. 27
F. 37
Answer: B
Explanation:
Pattern rule: Divide each number by 3 Sequence: 243, 81, 27, 9, 3 Differences: -162, -54, -18, -6
Medium #12
A. 22
B. 26
C. 21
D. 20
E. 16
F. 18
Answer: C
Explanation:
Pattern rule: Triangular numbers: T(n) = n(n+1)/2, starting from n=2 Sequence: 3, 6, 10, 15, 21 Differences: +3, +4, +5, +6
Medium #13
A. 44
B. 42
C. 28
D. 49
E. 41
F. 43
Answer: B
Explanation:
Pattern rule: Add 7 to each number Sequence: 14, 21, 28, 35, 42 Differences: +7, +7, +7, +7
Medium #14
A. 21
B. 22
C. 26
D. 29
E. 20
F. 16
Answer: A
Explanation:
Pattern rule: Alternating: +7, then −1 Sequence: 9, 16, 15, 22, 21 Differences: +7, -1, +7, -1
Medium #15
A. 70
B. 66
C. 69
D. 71
E. 72
F. 76
Answer: A
Explanation:
Pattern rule: Subtract 3 from each number Sequence: 82, 79, 76, 73, 70 Differences: -3, -3, -3, -3
Medium #16
A. 18
B. 16
C. 26
D. 20
E. 22
F. 21
Answer: F
Explanation:
Pattern rule: Triangular numbers: T(n) = n(n+1)/2, starting from n=2 Sequence: 3, 6, 10, 15, 21 Differences: +3, +4, +5, +6
Medium #17
A. 29
B. 25
C. 18
D. 24
E. 23
F. 19
Answer: D
Explanation:
Pattern rule: Differences increase by 2 each time (+2, +4, +6...) Sequence: 4, 6, 10, 16, 24 Differences: +2, +4, +6, +8
Medium #18
A. 16
B. 22
C. 12
D. 18
E. 17
F. 23
Answer: E
Explanation:
Pattern rule: Alternating: +4, +3, +4, +3... Sequence: 3, 7, 10, 14, 17 Differences: +4, +3, +4, +3
Medium #19
A. 21
B. 19
C. 20
D. 25
E. 17
F. 15
Answer: C
Explanation:
Pattern rule: Differences increase by 1 each time (+1, +2, +3...) Sequence: 10, 11, 13, 16, 20 Differences: +1, +2, +3, +4
Medium #20
A. 34
B. 29
C. 23
D. 30
E. 24
F. 28
Answer: B
Explanation:
Pattern rule: Differences increase by 2 each time (+3, +5, +7...) Sequence: 5, 8, 13, 20, 29 Differences: +3, +5, +7, +9
Hard
Hard #21
A. 54
B. 42
C. 55
D. 62
E. 56
F. 41
Answer: C
Explanation:
Pattern rule: Add 7 to each number Sequence: 20, 27, 34, 41, 48, 55 Differences: +7, +7, +7, +7, +7
Hard #22
A. 25
B. 18
C. 23
D. 24
E. 29
F. 19
Answer: D
Explanation:
Pattern rule: Two interleaved sequences: (3, 5, 7) and (14, 19, 24) Sequence: 3, 14, 5, 19, 7, 24 Differences: +11, -9, +14, -12, +17
Hard #23
A. 6
B. 4
C. 20
D. 5
E. 73
F. 57
Answer: D
Explanation:
Pattern rule: Divide each number by 2 Sequence: 160, 80, 40, 20, 10, 5 Differences: -80, -40, -20, -10, -5
Hard #24
A. 37
B. 41
C. 31
D. 32
E. 35
F. 36
Answer: F
Explanation:
Pattern rule: Triangular numbers: T(n) = n(n+1)/2, starting from n=3 Sequence: 6, 10, 15, 21, 28, 36 Differences: +4, +5, +6, +7, +8
Hard #25
A. 41
B. 26
C. 55
D. 40
E. 42
F. 43
Answer: A
Explanation:
Pattern rule: Subtract 7 from each number Sequence: 76, 69, 62, 55, 48, 41 Differences: -7, -7, -7, -7, -7
Hard #26
A. 72
B. 73
C. 66
D. 68
E. 61
F. 67
Answer: F
Explanation:
Pattern rule: Subtract 3 from each number Sequence: 82, 79, 76, 73, 70, 67 Differences: -3, -3, -3, -3, -3
Hard #27
A. 33
B. 28
C. 29
D. 34
E. 39
F. 35
Answer: D
Explanation:
Pattern rule: Two interleaved sequences: (1, 6, 11) and (18, 26, 34) Sequence: 1, 18, 6, 26, 11, 34 Differences: +17, -12, +20, -15, +23
Hard #28
A. 65
B. 34
C. 64
D. 63
E. 128
F. 48
Answer: C
Explanation:
Pattern rule: Multiply each number by 2 Sequence: 2, 4, 8, 16, 32, 64 Differences: +2, +4, +8, +16, +32
Hard #29
A. 32
B. 26
C. 20
D. 27
E. 22
F. 28
Answer: D
Explanation:
Pattern rule: Alternating: +6, then −1 Sequence: 11, 17, 16, 22, 21, 27 Differences: +6, -1, +6, -1, +6
Hard #30
A. 80
B. 4
C. 5
D. 1422
E. 476
F. 6
Answer: C
Explanation:
Pattern rule: Divide each number by 4 Sequence: 5120, 1280, 320, 80, 20, 5 Differences: -3840, -960, -240, -60, -15
Frequently Asked Questions
Number sequence questions assess your ability to identify patterns in series of numbers. You're given a sequence like '2, 4, 6, 8, ?' and must determine the rule (adding 2) to find the next number (10). These questions test logical reasoning and are widely used in employment aptitude tests.
Mostly no — but at harder difficulties you may encounter named sequences such as Fibonacci-like (each term = sum of the previous two), primes, squares, cubes, triangular numbers, factorials, and digit-sum patterns. Easy and most medium puzzles use only basic arithmetic progressions. If you don't know a named sequence, you can still solve most puzzles by looking for differences, ratios, or alternating steps between consecutive terms.
Patterns include: constant differences (+3, +3, +3), constant ratios (×2, ×2, ×2), increasing differences (+1, +2, +3), alternating operations (+5, -2, +5, -2), two interleaved sequences, and compound rules. All patterns can be discovered by examining the sequence — no prior knowledge required.