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Grade 3 Reading and Debugging Code Computer Worksheets

Grade 3 computer science practice: Read a program and debug it using evidence from tests.

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Sample reading and debugging code questions

Read each test result and choose the kind of bug the evidence points to. These examples come from the Easy setting; every generated worksheet draws a fresh set.

  1. A lamp should switch on when the room is dark, but the code tests IF the room is bright. What kind of bug is this?

    mismatched name · wrong condition

  2. A square needs four sides, but the code says REPEAT 3 times: move and turn right 90. What kind of bug does the open shape show?

    missing step · wrong number

  3. A program saves the file before the new title is typed, so the old title stays. What kind of bug is this?

    wrong order · wrong number

  4. The code sets a variable called total but later changes a variable called totl, and the display never moves. What kind of bug is this?

    mismatched name · extra repeat

Check the sample answers
  1. wrong condition
    The test checks the opposite of what the task describes.
  2. wrong number
    The repeat count is one less than the four sides required.
  3. wrong order
    The save runs too early to include the change.
  4. mismatched name
    Two different names create two separate storage places.

Practice focus

A bug is a mistake in code. Test results are evidence that shows which step is wrong, so a fix can be checked afterwards.

Grade placement is a planning guide for choosing practice. The registry records standard-code mappings as unreviewed, so these pages are not a claim of alignment with a national standard.

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About these worksheets

Read a program and debug it using evidence from tests. These Grade 3 computer science worksheets stay with that single skill: every question is answerable from the printed page, and the answer sheet explains why each answer is correct.

How to use the worksheets

  1. Choose a difficulty, then read the printed directions before answering the first question.
  2. Complete the questions on paper, marking one answer for each item.
  3. Compare the result with the answer sheet and read the short explanation together.

How this practice can help students

A bug is a mistake in code. Test results are evidence that shows which step is wrong, so a fix can be checked afterwards. Generating the page again keeps the same learning goal while changing the questions, so a learner can revisit the skill without repeating the same items.

Review and next steps

Ask the learner to say what made one answer better than the others. Grade placement is a planning guide for choosing practice. The registry records standard-code mappings as unreviewed, so these pages are not a claim of alignment with a national standard.

Read a program and debug it using evidence from tests in Grade 3

Grade 3 computer science practice: Read a program and debug it using evidence from tests.

How to use these worksheets

  • Choose a difficulty that lets the learner succeed, then move up.
  • Press Generate for a new set of questions whenever more practice is needed.
  • Print the sheet and keep the optional answer page to mark it in seconds.

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These grade 3 reading and debugging code computer worksheets are made for Grade 3 learners, with four difficulty levels so you can match the practice to the child.
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