Metric whole-number formatting According to common metric drawing conventions, a metric dimension that is a whole number is written without a decimal point or trailing zero (for example, 12 rather than 12.0).

Introduction / Context:
Consistent numeric formatting improves readability and prevents misinterpretation. In metric drawings, whole-number dimensions are typically shown without decimal points or trailing zeros. This convention keeps the drawing clean and reduces confusion about implied precision while still allowing tolerances to control actual acceptance limits.

Given Data / Assumptions:

• The drawing uses SI (metric) units.
• Default tolerance policy is stated in the title block or per-feature.
• Readers understand that the number of decimal places does not alone define tolerance unless specified by a drawing convention.

Concept / Approach:
Many organizations follow the practice: whole numbers without decimals (e.g., 12), and decimals used only when needed (e.g., 12.5). Precision and acceptance are governed by explicit tolerances (limits, ± values, or tables), not by writing 12.0 versus 12.00. This helps avoid implying false precision and keeps attention on the tolerance specification.

Step-by-Step Solution:

Verification / Alternative check:
Audit the drawing for consistency and ensure the CAD dimension style matches the metric formatting rules adopted by your organization.

Why Other Options Are Wrong:
Restricting the rule to specific disciplines or part types is incorrect. Tolerances, not decimal places, control precision; therefore “Only true when toleranced” is misleading.

Common Pitfalls:
Mixing inch-style formatting conventions with metric, adding unnecessary zeros that suggest tighter than intended precision, or leaving the title-block tolerance ambiguous.

Final Answer:
Correct