Calculation puzzle

[donkirkby]

Some old books contain puzzles where you have to use the pips to form three- or four-digit numbers in multiplications or sums. I like the idea, but I find it tedious to try and construct a set of equations that use up all the dominoes. I wonder if I could construct puzzles like a sudoku, where you get a bunch of face down dominoes, with a few face up. Then you have to work out what the face down dominoes are that can correctly complete the set of equations.
Hopefully, I can construct them so the answer can be deduced, a bit like my dominosa puzzles.