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Mirror Robot

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Teacher steps

  1. The left half shows a shape. The gold line is the mirror.
  2. Children tap squares on the right to make the mirror image.
  3. Press Check. Yellow = missing, red = extra.
  4. Fix and check again.
  5. Next shape. Ask: what rule did you follow?

Time: 35 min · Maps to: CBSE Computational Thinking, Class 4 (symmetry, sorting rules, multi-step instructions)

Activity

Levels

  1. Try it: mirror shape 1.
  2. Train it: one child gives steps (“2 up, 1 right”), the other taps.
  3. Break it & fix it: make a mistake on purpose and let the class find it with Check.

Badges:

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How AI works

  1. Symmetry is a rule: each square has a partner across the line.
  2. Computers store pictures as grids of squares (pixels).
  3. A rule lets a computer flip a picture in one step.

What we learned: Symmetry is a rule: each square has a partner across the line. A rule lets a computer flip a picture in one step.

Aligned with AI4K12 Big Idea 2: Representation; mapped to CBSE Computational Thinking, Class 4 (symmetry, sorting rules, multi-step instructions).

Teacher guide

Goal: Symmetry is a rule: each square has a partner across the line. Time: 35 min. CBSE unit: CBSE Computational Thinking, Class 4 (symmetry, sorting rules, multi-step instructions).

Discussion questions

  1. How did you know where each square goes?
  2. Which letters of the alphabet are symmetric?
  3. Why do computers like rules?

Exit quiz

  1. The mirror line is also called the line of ___.
  2. Is the letter A symmetric? (yes/no)
  3. A tiny square in a picture is a ___.

Answers

  1. The mirror line is also called the line of ___. symmetry
  2. Is the letter A symmetric? (yes/no) yes
  3. A tiny square in a picture is a ___. pixel

Safety: Teacher-led. Use only the teacher's device. Camera is off until the teacher turns it on. Do not show children's faces; use objects. No student personal data. No class codes, dashboards or galleries are used.

Class certificate

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← AI Lab AI practicals

Aligned with NEP 2020 and mapped to CBSE’s Computational Thinking & AI curriculum (Classes 3–8). Big Ideas follow the AI4K12 framework. NextBridge is independent and not affiliated with CBSE or AI4K12.

NextBridge AI Lab · Grade 4 · Mirror Robot — Worksheet

Name: ______________ Class: ____ Date: ______

  1. Draw half a butterfly; complete the mirror half.
  2. List 3 symmetric letters.
  3. Write steps to draw a square on squared paper.

Exit quiz:

  1. The mirror line is also called the line of ___.
  2. Is the letter A symmetric? (yes/no)
  3. A tiny square in a picture is a ___.

Teacher answer key · Mirror Robot

  1. Both halves match across the line.
  2. A, H, M, O, T, U, V, W, X, Y (any 3).
  3. e.g. 3 right, 3 down, 3 left, 3 up.

Exit quiz:

  1. The mirror line is also called the line of ___. symmetry
  2. Is the letter A symmetric? (yes/no) yes
  3. A tiny square in a picture is a ___. pixel

Maps to: CBSE Computational Thinking, Class 4 (symmetry, sorting rules, multi-step instructions)

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