Keep Source Values Separate From Rounded Book Figures

Keep the original supported value, its unit, and its source separate from the rounded wording used in the book. Record the display convention and calculate from the appropriate retained inputs. When a value changes, update its dependent tables, examples, and explanations rather than editing only the visible number.

Identify what each number represents

Begin with the purpose of a value in the manuscript. It might be a measured quantity, a calculated result, a published estimate, or a deliberately invented teaching input. Record that distinction before choosing how many digits to display. A number that looks precise on the page is not necessarily based on equally precise evidence.

Keep the unit and relevant context with the value. A bare number copied into a drafting note can lose the meaning that makes it usable. For sourced material, retain the reference and any stated uncertainty or qualification. For fictional examples, mark the input as fictional so a polished table is not later mistaken for observed data.

Preserve the supported source value

Store the value as supplied by the verified source or accepted calculation record, without replacing it with the shortened display version. Retain the source's limits rather than adding digits that were never supported. If a record gives an approximate amount, do not transform it into an exact measurement by changing its formatting.

Give the record a stable identifier that can be connected to its manuscript uses. A simple project table may be sufficient; the important point is that the original supported value remains recoverable. Keep the published wording in a separate field or document location. That separation allows later editorial changes without losing the basis of the number.

Choose a display convention for the reader task

Decide how much detail the reader needs in this particular context. A broad comparison may call for a simpler presentation than a worked calculation. Record the chosen convention and apply it consistently within the relevant table or example. Do not assume that one number of decimal places is appropriate throughout an entire nonfiction book.

Check whether simplification changes the conclusion the text asks readers to draw. Two distinct values may appear equal after rounding, or a displayed total may seem inconsistent with displayed components. Explain a relevant limitation or revise the presentation when needed. Avoid changing the underlying source figures merely to make the visible arithmetic look tidy.

Keep calculation inputs distinct from display values

For an example with calculations, identify the inputs actually used and preserve the steps or reproducible calculation record. Decide whether readers are expected to calculate from displayed values or inspect a result derived from more detailed retained inputs. State that choice clearly enough to make the exercise understandable.

Do not switch between those approaches halfway through an example. If the answer uses inputs readers cannot see, explain the basis or provide the needed values. If readers are meant to reproduce the result from the printed table, check that they can do so under the stated convention. A correct private calculation can still produce an unusable teaching example when its visible inputs differ without explanation.

Trace revisions through every representation

When the source value or accepted input changes, identify its appearances in prose, tables, charts, captions, and answer sections. Recalculate dependent results before revising their displayed forms. Keep a record of what changed and why so an editor does not restore an older rounded figure simply because it appears in another chapter.

Inspect descriptions and illustrative graphics that may contain the same number. A chart label can retain an earlier value after the main table has been corrected. Update the actual editable source for each representation and rebuild its export. Do not treat a corrected screenshot as a replacement for the source data that generated it.

Verify the final relationship between evidence and presentation

Review a sample of ordinary and sensitive numeric passages, including values near a comparison boundary and totals with several components. Confirm the source, unit, calculation basis, display convention, and dependent wording. Obtain appropriate subject expertise for consequential quantitative claims rather than relying solely on an editorial consistency pass.

Save the numeric source records and conventions with the manuscript's release materials. Keep uncertainty and approximation visible where they affect interpretation. The aim is a clear presentation whose numbers remain traceable to their actual basis, not a page filled with extra digits that create an unsupported impression of accuracy.