Sorry, I spaced on this question. DD comes by it honestly. 
My DD has classic 'boy type' ADHD so the things I do may not work on inattentive.
Some things I think helped:
Installing an internal locus of control. Working really hard on giving her her own idea of how things are going. Essentially asking if she thinks her work is good or she's done enough.
How to talk... book. Very good.
The ever-decreasing instructions. Please could you brush your teeth. Teeth please. Teeth. <points at brush>
Finding something that requires work, not too much, that they really want. DD loves piano. It was the first time I ever saw her appropriately focused (not hyper or none). It has gradually helped her work out that hard work = success = happiness. But my God practise was a nightmare. Just enough to please the teacher, not enough to bore DD.
Working with her ADHD not against. If she has a burst of hyper focus, we try to do ALL her homework during that brief window.
Giving worse alternatives. "Come to the tip with me DD" "Nnnnoooooooo" "OK what will you do instead (and watch YouTube ins't an option?" "Fine I'll do homework".
Working on ways to help focus. Music on, bouncy ball, fidgets and DD can do work. Silent, still room, she's a nightmare.
Making her the driver of the car. Working out what will help herself. What does she want, how can she achieve it?
Hyper focus does help though and if yours has pure inattentive, it's really difficult.