GRADE 7 · COMPUTATIONAL THINKING · ABOUT 45 MINUTES

Trace a function

Separate input, transformation and returned output.

Understand the idea

A function can name a reusable transformation. A returned value is the result passed back to the caller.

WORKED EXAMPLE

Let doublePlusOne(x) return 2x + 1. With input 4, double to 8, add 1 and return 9.

Watch it step by step

Step 1 of 4

Input

Call doublePlusOne with x = 4.

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Input
Call doublePlusOne with x = 4.
Double
Calculate 2 × 4 = 8.
Add
Calculate 8 + 1 = 9.
Return
Return 9 to the caller.

TRY BEFORE CHECKING

Exercises with feedback

MAKE SOMETHING YOU CAN EXPLAIN

Your practical challenge

Write pseudocode and test the function with 0, 4 and 7. Show expected results first.

My project notes or dictated explanation

Review your evidenceIdentify input and outputCalculate expected resultsCompare predictions with the trace

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 an inverse transformation for a valid output.

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