GRADE 4 · COMPUTATIONAL THINKING · ABOUT 40 MINUTES

Trace a conditional choice

Choose an action from the current condition.

Understand the idea

An if/else instruction selects one branch when it runs. Check the current situation each time.

WORKED EXAMPLE

At (1,0), a wall occupies (2,0). If right is clear move Right; else move Down. The robot reaches (1,1).

Watch it step by step

Step 1 of 4

Start

Begin at (0,0); wall at (2,0).

Time per stepMotion off

Choose Play to advance steps automatically.

Read or choose any step

Start
Begin at (0,0); wall at (2,0).
Approach
Move Right to (1,0).
Check
The next square right contains the wall.
Else
Move Down to (1,1).

TRY BEFORE CHECKING

Exercises with feedback

MAKE SOMETHING YOU CAN EXPLAIN

Your practical challenge

Draw the two branches and trace one clear-square case and one blocked case.

My project notes or dictated explanation

Review your evidenceState the conditionTrace one branch per caseTest both outcomes

These ticks are your self-review. They do not automatically assess project quality. Ask an adult or partner to review what you can show.

What did I learn, change or need help with?

Use the skill in a new situation

Describe what happens if Down is also blocked.

Your local practice space

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