If you turn the volume up does it also say what you are tapping ? If it does you have VoiceOver (one of the accessibility features) 'on'. Try triple-clicking the home button and see if that turns it off, and if it does you can then change what a triple-click does via Settings > General > Accessibility > Accessibility Shortcut (or Triple-Click Home depending upon the iOS version).
If that doesn't turn it off you can either turn it off directly on the iPad (you need to use a tap-to-select and then double-tap to activate/type process and 3 fingered scrolling ; so to type a digit of your passcode tap the digit to select it and then double-tap it to type the digit) to go into Settings > General > Accessibility and turn VoiceOver 'off', or you can do it by connecting to your computer's iTunes (after typing in your passcode via the tap/double-tap process) : https://support.apple.com/kb/HT204390
Or if you have Siri enabled you could try using that to tell the iPad to turn VoiceOver 'off'