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Computer science · Grades 3–6

Algorithms without a computer

An algorithm is a clear sequence of instructions for a task.

Make a worksheet

Understand the idea

Make steps precise

An algorithm is a clear sequence of instructions for a task.

Trace before changing

Follow each step exactly to locate where an unexpected result begins.

Examples and reasoning

Which instruction is more precise?

Move forward three squares.

Move forward three squares.

Which describes a loop?

repeat a set of steps

repeat a set of steps

Check your understanding

  1. Which describes a condition?

    1. write the title
    2. count all pages
    3. if the next square is blocked, turn right
    4. always stop at the first word

  2. A robot repeats move 2 squares three times. How many squares does it move?

  3. Start at 5. Add 3, then double. What value results?

  4. Start at 5. Double, then add 3. What value results?

Answers and marking notes

Answers and marking notes
  1. if the next square is blocked, turn right

    if the next square is blocked, turn right

  2. 6

    2 × 3 = 6

  3. 16

    (5 + 3) × 2 = 16

  4. 13

    5 × 2 + 3 = 13

Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.