select entire rows or columns

Numbers

Tap anywhere in the table to show letters above the columns and numbers to the left of the rows, then do any of the following:

Select a single row or column: Tap the number or letter for the row or column.
Select multiple adjacent rows or columns: Tap the number or letter for a row or column, then drag a blue dot across the adjacent rows or columns.
Select non-adjacent rows or columns: Tap the number or letter for a row or column, tap Select Cells, then tap more rows or columns and drag a blue dot across the cells you want to select (or tap Select All to select all cells in the table). When you finish selecting tap Done.

Helpful?

Numbers User Guide for iPhone