What is the best way to have a data and the slide number appear on every slide?
choose Insert, Header and Footer, click Slide tab, select the desired options, click Apply to All is the best way to have a data and the slide number appear on every slide.
Right-click one of the selected slides, and then click Copy. To retain the original design of the copied slides, click the Paste Options button , which appears near the pasted slides on the Outline or Slides tab in Normal view, or in the Slides pane, and then click Keep Source Formatting.
Scroll up to the Master Slide above and click onto it. In the ribbon menu, go to the Insert tab and click onto Header & Footer. You should see that the Date and time and Footer options are ticked. Click onto the Apply to All button.
To retain the original design of the copied slides, click the Paste Options button , which appears near the pasted slides on the Outline or Slides tab in Normal view, or in the Slides pane, and then click Keep Source Formatting.