Cracking the Safe is a free puzzle app that's perfect for kids. Since D*B = 8, you then can eliminate 0, 1, 3, 5, 6 from both D & B. You get the idea.
There are 25 levels. I've done a few at the beginning and a few at the end. They are all at the same difficulty level.
If you are a teacher of mathematics, do give this to your students.
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