Nice, I can see my mistake now. Thank you for taking the time to reply!

Your answers are wrong, for instance, you're returning 10 which ends with 0. These are the three sample tests your code is failing:

test.assert_equals(no_boring_zeros(1050), 105)
test.assert_equals(no_boring_zeros(-1050), -105)
test.assert_equals(no_boring_zeros(2016), 2016)

And the tests are fine.

I think this these test cases are wrong:

10 should equal 105
-10 should equal -105
201 should equal 2016

105, -105, and 2016 don't end with 0