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Grade 9 Lists & Arrays Worksheet with Answers
Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Computer Science
Unit 2: Programming FundamentalsListsCSTA 3A-AP-14
Indexing, slicing and changing lists, and finding their length and values. This free high 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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Practice Sheetaethelsystems.comLists & Arrays
Grade 9 · Computer Science
Name
Class
Date
Learning goal: Lists · CSTA 3A-AP-14
Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.
RememberLists start at index 0
- 1
nums = [27, 49, 37, 38, 32, 41, 14]. What is nums[3]? (Indexes start at 0.)
- 2
nums = [13, 13, 1, 1, 17, 48]. What is nums[5]? (Indexes start at 0.)
- 3
nums = [15, 44, 39, 3, 18, 34, 36]. What is nums[4]? (Indexes start at 0.)
- 4
nums = [30, 25, 25, 2, 42, 34, 5]. What is nums[0:3]?
- 5
nums = [9, 11, 44, 40, 28, 2, 16]. What is nums[1:7]?
- 6
nums = [13, 48, 4, 16, 39, 48]. What is nums[1:4]?
- 7
nums = [35, 21, 44, 2, 24, 47]. What is nums[-2]?
- 8
nums = [27, 35, 48, 48, 25, 27, 4]. What is nums[5]? (Indexes start at 0.)
- 9
nums = [15, 30, 21, 32, 49, 39, 6]. What is nums[-2]?
- 10
nums = [6, 47, 16, 16, 21, 43]. What is nums[1:3]?
- 11
nums = [34, 34, 34, 4, 37, 11, 18]. What is nums[0]? (Indexes start at 0.)
- 12
nums = [8, 43, 6, 5, 27, 31, 38]. What is nums[-2]?
★ Challenge corner for fast finishers
In a list of every 4-bit pattern, how many patterns have exactly one 1?
How did I do?
Teacher's comments
Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/9/lists_arrays
Answer key — Lists & Arrays (Grade 9)
- 1.38
- 2.48
- 3.18
- 4.[30, 25, 25]
- 5.[11, 44, 40, 28, 2, 16]
- 6.[48, 4, 16]
- 7.24
- 8.27
- 9.39
- 10.[47, 16]
- 11.34
- 12.31
- ★4
Answer key (click to show)
- 1.38
- 2.48
- 3.18
- 4.[30, 25, 25]
- 5.[11, 44, 40, 28, 2, 16]
- 6.[48, 4, 16]
- 7.24
- 8.27
- 9.39
- 10.[47, 16]
- 11.34
- 12.31
- ★4 (challenge corner)
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