Gotcha. The easiest way to do that across all records in a given view (or group if you’re grouping records) is to look at the summary bar. If you’re viewing your table full screen, it’s easy to overlook because it’s at the very bottom of the screen. By default for most numeric fields, it’s set to Sum mode, which adds up all values (numeric, currency, etc) for each field. It also list the total number of records at its far left edge. Here’s a compacted view (I manually shrank my window to make it easier to see) that shows the summary bar below a number of records:
Click on any of those “Sum” entries and you can change the mode depending on the field type.
