I have just created a project for printing numbers in scientific notation:
http://scratch.mit.edu/projects/kevin_karplus/80371
This upgrades earlier projects I had for printing integers or numbers with decimals, as it can do anything they can do.
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The print_decimal and print_number projects are simpler versions of the same idea, if you want to start with the basic idea and work your way up:
http://scratch.mit.edu/projects/kevin_karplus/2163
http://scratch.mit.edu/projects/kevin_karplus/2951
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