If your table is too big for one slide, split the table over two slides and add a transition.
Paste the full table onto one slide.
Right-click the slide thumbnail and select Duplicate Slide.
Delete the appropriate rows or columns from each slide.
Select the rows or columns, right-click, and select Delete > Delete Rows or Delete > Delete Columns.
Add a transition to move from the first slide to the next.
Select the Transitions tab and select the transition you want.
To see what it looks like when presenting, select the first slide, select Slide Show, and then click the slide.