Sometimes only a section of a Google Slides presentation needs numbers: a workshop exercise, an appendix, or a technical sequence. The numbering dialog includes an option for the selected slides, so you do not need to apply numbering to the whole deck and then manually erase unwanted labels.
Select the target section
Open the presentation on a computer. In the filmstrip, select the slide or slides that should receive numbers. Use the highlighted thumbnails to confirm the exact scope. A selected text box on the canvas is not the same as selecting the slide thumbnails for a section-wide command.
Apply numbers to the selection
Choose Insert > Slide numbers and use Apply to selected. Review any title-slide exclusion setting in the same dialog so that it does not unexpectedly omit a selected title slide. Leave unrelated slides outside the selection.
This controls where native numbers are applied. It should not be presented as a separate custom numbering system for each section, or as a promise that the selected section begins at a particular manually chosen number.
Review the boundaries
Inspect the first selected slide, the last selected slide, and the slides immediately outside the selection. Check readability against their backgrounds and remove any obsolete manually typed number only after identifying it. If some numbers already existed elsewhere, verify their state separately; applying numbers to a new selection is not proof that every other slide is unnumbered. Finally, check the version you intend to present or distribute so that the numbering matches that specific copy.
References
Reviewed against the linked official product guidance on November 3, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.