ISEE Middle Level Quiz: Missing Sequence Terms
20 questions · exam conditions
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Missing Sequence TermsQuestion 1 of 20

What is the missing term: 11, 14, 17, __, 23?

18
19
20
21
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ISEE Middle Level Quiz

ISEE Middle Level Quiz: Missing Sequence Terms

Practice Missing Sequence Terms in ISEE Middle Level with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Missing Sequence Terms, giving you a quick way to practice the rules, question types, and explanations that matter most for ISEE Middle Level.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

What is the missing term: 11, 14, 17, __, 23?

  1. 18
  2. 19
  3. 20 (correct answer)
  4. 21
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of adding 3 to the previous term. The correct answer, 20, works because it follows the pattern, ensuring sequential consistency by adding 3 to 17 and leading to 23 by adding another 3. A common distractor might suggest 18, which fails because it assumes addition of 1 instead of 3. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 2

What is the missing term: 4, 12, 36, __, 324?

  1. 96
  2. 100
  3. 108 (correct answer)
  4. 120
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of multiplying by 3. The correct answer, 108, works because it follows the pattern, ensuring sequential consistency by multiplying 36 by 3 and leading to 324 by multiplying again by 3. A common distractor might suggest 96, which fails because it assumes multiplication by about 2.666. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 3

What number logically comes next in this sequence? 4, 9, 16, 25, 36, ...

  1. 42
  2. 49 (correct answer)
  3. 55
  4. 64
Explanation: The sequence consists of perfect squares of consecutive integers, starting with 2 squared. 4 = 2² 9 = 3² 16 = 4² 25 = 5² 36 = 6² The next term would be 7², which is 7 * 7 = 49.

Question 4

A scientist observes a bacterial culture. The number of bacteria is 50 on Day 1. Each day, the population increases by 15 and then the scientist removes 5 for testing.

Following the pattern described, how many bacteria will be in the culture on Day 5?

  1. 90 (correct answer)
  2. 95
  3. 100
  4. 105
Explanation: The net change each day is an increase of 15 and a decrease of 5, which is a net increase of 10 bacteria per day. This is an arithmetic sequence with a common difference of 10. Day 1: 50 Day 2: 50 + 10 = 60 Day 3: 60 + 10 = 70 Day 4: 70 + 10 = 80 Day 5: 80 + 10 = 90 There will be 90 bacteria on Day 5.

Question 5

Complete the sequence: 100, 50, 25, __, 254\tfrac{25}{4}.

  1. 10
  2. 12.5 (correct answer)
  3. 15
  4. 20
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of dividing by 2. The correct answer, 12.5, works because it follows the pattern, ensuring sequential consistency by dividing 25 by 2 and leading to 25/4 by dividing again by 2. A common distractor might suggest 10, which fails because it assumes subtraction instead of division. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 6

Complete the sequence: 30, 25, 20, __, 10.

  1. 12
  2. 13
  3. 14
  4. 15 (correct answer)
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of subtracting 5 from the previous term. The correct answer, 15, works because it follows the pattern, ensuring sequential consistency by subtracting 5 from 20 and leading to 10 by subtracting another 5. A common distractor might suggest 12, which fails because it assumes a subtraction of 8 instead of 5. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 7

Fill in the blank: 1, 4, 16, __, 256.

  1. 48
  2. 64 (correct answer)
  3. 96
  4. 128
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of multiplying by 4. The correct answer, 64, works because it follows the pattern, ensuring sequential consistency by multiplying 16 by 4 and leading to 256 by multiplying again by 4. A common distractor might suggest 48, which fails because it assumes multiplication by 3. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 8

Identify the missing term: 2, 3, 5, 8, __, 21.

  1. 11
  2. 12
  3. 13 (correct answer)
  4. 14
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of adding the two previous terms, like the Fibonacci sequence starting with 2 and 3. The correct answer, 13, works because it follows the pattern, ensuring sequential consistency as 5 + 8 = 13 and then 8 + 13 = 21. A common distractor might suggest 11, which fails because it ignores the sum of the prior two terms. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 9

Complete the sequence: 8, 4, 2, __, 12\tfrac{1}{2}.

  1. 1 (correct answer)
  2. 2
  3. 32\tfrac{3}{2}
  4. 14\tfrac{1}{4}
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of dividing by 2. The correct answer, 1, works because it follows the pattern, ensuring sequential consistency by dividing 2 by 2 and leading to 1/2 by dividing again by 2. A common distractor might suggest 3/2, which fails because it assumes multiplication instead of division. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 10

Identify the missing term: 2,3,5,8,<u>?</u>,212, 3, 5, 8, <u>?</u>, 21.

  1. 11
  2. 12
  3. 13 (correct answer)
  4. 14
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence (2, 3, 5, 8, ?, 21), each term follows the Fibonacci-like rule where each term is the sum of the two preceding terms: 2+3=5, 3+5=8, 5+8=13, 8+13=21. The correct answer, 13 (C), works because it follows the pattern, ensuring sequential consistency. A common distractor might suggest 11 (A), which fails because it doesn't follow the sum rule. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 11

A recursive sequence is defined by a(1) = 2, and a(n) = a(n-1) + n + 1 for n > 1. What is the value of a(4)?

  1. 5
  2. 9
  3. 14 (correct answer)
  4. 20
Explanation: We are given the first term and a rule to find the subsequent terms. a(1) = 2 To find a(2), let n=2: a(2) = a(1) + 2 + 1 = 2 + 3 = 5. To find a(3), let n=3: a(3) = a(2) + 3 + 1 = 5 + 4 = 9. To find a(4), let n=4: a(4) = a(3) + 4 + 1 = 9 + 5 = 14.

Question 12

Fill in the blank: 6, 10, 14, __, 22.

  1. 16
  2. 18 (correct answer)
  3. 20
  4. 17
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of adding 4 to the previous term. The correct answer, 18, works because it follows the pattern, ensuring sequential consistency by adding 4 to 14 and leading to 22 by adding another 4. A common distractor might suggest 16, which fails because it assumes a different difference like +2 from 14, breaking the consistent +4 pattern. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 13

Identify the missing term: 1, 1, 2, 3, __, 8.

  1. 4
  2. 5 (correct answer)
  3. 6
  4. 7
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of adding the two previous terms, like the Fibonacci sequence. The correct answer, 5, works because it follows the pattern, ensuring sequential consistency as 2 + 3 = 5 and then 3 + 5 = 8. A common distractor might suggest 4, which fails because it ignores the sum of the prior two terms. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 14

Complete the sequence: 2, 6, 18, __, 162.

  1. 36
  2. 48
  3. 54 (correct answer)
  4. 72
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of multiplying by 3. The correct answer, 54, works because it follows the pattern, ensuring sequential consistency by multiplying 18 by 3 and leading to 162 by multiplying again by 3. A common distractor might suggest 36, which fails because it incorrectly assumes multiplication by 2. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 15

What is the missing term: 3, 9, 27, __, 243?

  1. 54
  2. 72
  3. 81 (correct answer)
  4. 90
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence, each term follows the rule of multiplying by 3. The correct answer, 81, works because it follows the pattern, ensuring sequential consistency by multiplying 27 by 3 and leading to 243 by multiplying again by 3. A common distractor might suggest 72, which fails because it incorrectly assumes multiplication by 2.666 or an arithmetic pattern. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 16

What is the missing term in this sequence: 6,10,14,<u>?</u>,226, 10, 14, <u>?</u>, 22?

  1. 16
  2. 17
  3. 18 (correct answer)
  4. 20
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence (6, 10, 14, ?, 22), each term follows the rule of adding 4 to the previous term: 6+4=10, 10+4=14, 14+4=18, 18+4=22. The correct answer, 18 (C), works because it follows the pattern, ensuring sequential consistency. A common distractor might suggest 16 (A), which fails because it only adds 2 instead of 4. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 17

Fill in the blank: 9,13,17,<u>?</u>,259, 13, 17, <u>?</u>, 25.

  1. 19
  2. 20
  3. 21 (correct answer)
  4. 22
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence (9, 13, 17, ?, 25), each term follows the rule of adding 4 to the previous term: 9+4=13, 13+4=17, 17+4=21, 21+4=25. The correct answer, 21 (C), works because it follows the pattern, ensuring sequential consistency. A common distractor might suggest 20 (B), which fails because it only adds 3 instead of 4. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 18

What is the missing term in this sequence: 1,4,9,<u>?</u>,251, 4, 9, <u>?</u>, 25?

  1. 12
  2. 14
  3. 15
  4. 16 (correct answer)
Explanation: This question tests middle school quantitative reasoning skills, specifically finding a missing term in a sequence. Understanding sequences involves recognizing patterns such as arithmetic or geometric progressions. In this sequence (1, 4, 9, ?, 25), each term follows the rule of perfect squares: 1²=1, 2²=4, 3²=9, 4²=16, 5²=25. The correct answer, 16 (D), works because it follows the pattern, ensuring sequential consistency. A common distractor might suggest 15 (C), which fails because it's not a perfect square. To improve, students should practice identifying sequence types and applying the correct operations, ensuring they double-check their calculations and rule applications.

Question 19

A sequence is generated by the following rule: multiply the previous term by 3 and then subtract 5. If the first term is 4, what is the fourth term?

  1. 7
  2. 16
  3. 43 (correct answer)
  4. 124
Explanation: Let's generate the sequence step-by-step. Term 1 = 4 (given). Term 2 = (4 * 3) - 5 = 12 - 5 = 7. Term 3 = (7 * 3) - 5 = 21 - 5 = 16. Term 4 = (16 * 3) - 5 = 48 - 5 = 43. The fourth term is 43.

Question 20

Consider the sequence where the n-th term is given by the formula 3n² - 5. What is the 6th term of this sequence?

  1. 31
  2. 68
  3. 103 (correct answer)
  4. 108
Explanation: To find the 6th term, substitute n = 6 into the formula 3n² - 5. Term 6 = 3 * (6²) - 5 Term 6 = 3 * 36 - 5 Term 6 = 108 - 5 Term 6 = 103