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Grade 8 Searching & Sorting Worksheet with Answers

Grade 8 (US) · Year 9 (UK) · Class 8 (India) · Computer Science

Unit 3: AlgorithmsSearching & SortingCSTA 2-AP-10

Counting the steps in linear and binary search and tracing bubble and selection sort passes. This free middle school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Searching & Sorting

Grade 8 · Computer Science

Score___ / 12

Name

Class

Date

Learning goal: Searching & Sorting · CSTA 2-AP-10

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

RememberSearch & sort

Linear searchcheck one by oneup to n checksBinary searchsorted list: check middle,throw away halfBubble sortswap neighbours thatare in the wrong orderSelection sortfind the smallest,swap it to the front
  1. 1

    Binary search on the sorted list 7, 8, 13, 20, 23, 24, 27, 34, 35. Which number is checked first (the middle item)?

    7081132203234245276347358index
  2. 2

    Binary search on the sorted list 6, 11, 12, 15, 16, 21, 26, 27, 35. Which number is checked first (the middle item)?

    60111122153164215266277358index
  3. 3

    Bubble sort (smallest to largest). Write the list after the first full pass: 38, 15, 37, 14, 11, 30

    380151372143114305index
  4. 4

    Binary search on the sorted list 7, 9, 14, 18, 19, 21, 26, 32, 40. Which number is checked first (the middle item)?

    7091142183194215266327408index
  5. 5

    Binary search on the sorted list 12, 16, 18, 22, 23, 25, 26, 33, 40. Which number is checked first (the middle item)?

    120161182223234255266337408index
  6. 6

    Linear search checks items one by one from the left. List: 12, 35, 41, 10, 14, 6, 2, 22, 8. How many items are checked to find 14?

    120351412103144652622788index
  7. 7

    Binary search on the sorted list 4, 12, 15, 16, 22, 24, 33, 35, 41. Which number is checked first (the middle item)?

    40121152163224245336357418index
  8. 8

    Linear search checks items one by one from the left. List: 17, 13, 5, 27, 4, 32, 40, 33, 19. How many items are checked to find 27?

    1701315227344325406337198index
  9. 9

    Binary search on the sorted list 9, 16, 23, 24, 26, 27, 28, 35, 36. Which number is checked first (the middle item)?

    90161232243264275286357368index
  10. 10

    Bubble sort (smallest to largest). Write the list after the first full pass: 29, 23, 13, 10, 38, 19

    290231132103384195index
  11. 11

    Bubble sort (smallest to largest). Write the list after the first full pass: 36, 11, 4, 28, 15, 19

    36011142283154195index
  12. 12

    Binary search on the sorted list 6, 9, 21, 24, 27, 33, 35, 38, 41. Which number is checked first (the middle item)?

    6091212243274335356387418index

★ Challenge corner for fast finishers

How many different patterns can 7 bits make?

6432168421

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/8/search_sort

Answer key (click to show)
  1. 1.23
  2. 2.16
  3. 3.15, 37, 14, 11, 30, 38
  4. 4.19
  5. 5.23
  6. 6.5
  7. 7.22
  8. 8.4
  9. 9.26
  10. 10.23, 13, 10, 29, 19, 38
  11. 11.11, 4, 28, 15, 19, 36
  12. 12.27
  13. ★128 (challenge corner)

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  • Works well as a bell-ringer, exit ticket, homework set or quick quiz.
  • Have students self-check with the answer key, then correct their own mistakes before you review.
  • Generate a new version of the same topic for a re-test, so students can't just memorise the answers.

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