§§3.1–3.2: tenths and decimal place value. Power-of-ten scaling and rounding are supplementary representations.
Inspected 2026-10-23Decimal places in motion
What changes when the value of every digit becomes ten times as large?
Set up your investigation
Scale an exact thousandths value by powers of ten, then compare the exact result with a chosen rounding.
Write at least 8 characters. Each trial keeps its own inputs; later control changes do not rewrite earlier observations.
Observe the model
Your experiment starts with a prediction.
Set the controls above and run a trial. A diagram, exact quantities and an explanation will appear here.
EVIDENCE, SIDE BY SIDE
Your laboratory notebook
Keep up to 8 trials for this investigation. Compare two recorded observations with exactly one changed control. Writing is saved as participation evidence.
No trials yet. Start with the setup above.
A controlled comparison needs two observations with exactly one changed input.
Test your reasoning
Use at least 40 characters, a result from each trial and one model limitation. Your writing is not automatically graded.
Build your investigation evidence
- ○ Two observed trials with one changed control
- ○ Mechanism / reasoning check
- ○ Written explanation of at least 40 characters
These practice markers recalculate when evidence changes. They are not an official grade or a claim of mastery.
Curriculum and provenance
This is an original working investigation. Its selected source context does not establish full chapter coverage, official endorsement or prescribed-practical status. Detailed objective mapping remains provisional. Qualified subject-educator review is pending.