Individual tables from Excel spreadsheets (.xls, .xlsx) can be used on slides of PowerPoint presentations (.ppt, .pptx). You can do it by manually selecting the cells in your table and copy and paste them to your presentation so it is shown on one of your slides.
Also probably possible using 3rd party utilities, but they will probably do the very same thing, put a spreadsheet on one of the slides.
Open XLSX file Open PPTX fileAn universal picture and document converter
Office suite app for BlackBerry devices
Official release of Microsoft Office optimized for Google Android operating system
Microsoft office suite optimized for Windows Phone operating system
One of the many available document converters