I used to assign kids the entire paper to fill in the first week, but gradually I've come to assign just one note name per week, and stipulate that at home, they are to strike every one of THOSE keys up and down the keyboard every day.
(As long as 'ghost images' don't remain behind!) One new key at a time
You might also find it useful to laminate one of the online piano keyboards below, and allow your students to write on the keyboard with an erasable felt pen, to use the keyboard over and over. If you choose to print out this particular piano learning guide for your students (or yourself), I suggest laminating it, or using wide tape to cover the important parts of the page! INK IS SO EXPENSIVE, and we music teachers seem to need a lot of it.
