done

Need to fix description

Approved

With Dart translation updated, all languages now comfront to the requirement. (Except for Java, which is raised as a separate issue above)

Lua translation!

Removed language-specific examples from the description.

Groovy Translation

40 is your answer, 40 + 2 is the expected one. Not a kata issue. You're returning inside the loop at its first iteration.

Issue zith this one, in my local IDE it passes the tests, but fails here, because it seems the numbers in the test are rounded down.
Example: expanded_form(42) error: 40 should be equal 40 + 2

Any idea how this can happen?

so many ways to approach this one, very enjoyable

Python: not a single test with a whole number.

Your code will result in Integer Overflow because of this

Also, your code will fail for numbers with trailing zeros as such:

Test Failed
  Expected string length 42 but was 27. Strings differ at index 7.
  Expected: "6000000 + 800000 + 70000 + 3000 + 700 + 20"
  But was:  "600000080000070000300070020"

with the output panel displaying:

6873720
num 20
num 700
num 3000
num 70000
num 800000
num 6000000

OP solved it, closing