Flesh out the skeleton with the number seven

• 
  Jim Howson
• Published: 01 Jul 2009

The first thing to realise is that the four-digit number to be divided cannot possibly start with 2 or higher. In fact, it must start with exactly 10. With this established, the remaining construction work is straightforward.

As to the bonus puzzle, the only equation where BC can appear on both sides is:

625=25²

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