How can i turn off my ipad. The touch screen is not working Can not slide the off bottom.

Try to perform a forced restart, using these instructions:

• iPad models with Face ID: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then press and hold the Power button until the device restarts.
• iPad models with Home button, iPhone 6s or earlier, and iPod touch (6th generation) or earlier: Press and hold both the Home and the Top (or Side) buttons until you see the Apple logo.

and see if your screen is responding when done.

Regards

Giulio

You can shut down your iPad using the Sleep/Wake (top) button on your iPad - or from Settings:

Settings > General > Shut Down

Yes, if the screen responds to touch.