GRADE 8 · COMPUTATIONAL THINKING · ABOUT 45 MINUTES

Accumulate a list total

Trace a loop that updates an accumulator.

Understand the idea

An accumulator stores a running result. Initialise it before the loop, then update it once per item.

WORKED EXAMPLE

Start total = 0. For values 2, 4, 6, add each once: totals 0, 2, 6, 12.

Watch it step by step

Step 1 of 4

Initialise

total = 0.

Time per stepMotion off

Choose Play to advance steps automatically.

Read or choose any step

Initialise
total = 0.
Item 1
Add 2; total = 2.
Item 2
Add 4; total = 6.
Item 3
Add 6; total = 12.

TRY BEFORE CHECKING

Exercises with feedback

MAKE SOMETHING YOU CAN EXPLAIN

Your practical challenge

Make a trace table for the list and for an empty list. Explain the initial value.

My project notes or dictated explanation

Review your evidenceInitialise the accumulatorUpdate once per itemTest an empty input

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

Adapt the trace to count only values above 3.

Your local practice space

Choose a different space for another learner on this browser.

Notes and checks use this browser, separate from school sign-in.

Each space keeps each grade separate. These spaces are not private accounts; use separate browser profiles for privacy on a shared device. About your practice data

Next: Minimise data in a form →All six experiences