The classic full US keyboard with numpad nominally has 101 keys, HHKB style compact boards usually 60 or so. The bare minimum with all numbers and Fn keys may have as little as 40 keys. Hence:

  100%: full w/keypad,  
   80%: the main part plus cursors,  
   60%: just the main part, with 0-9,  
   40%: just QWERTY, no numbers at all.