INCORRECT ANSWERS

Answers for all 10s complements are wrong. Simple example:

According to APP: 10s complement of 555 = 555.
According to MATH: 10s complement of 555 = 445.

The App is using incorrect math logic to calculate the 10s complements.

I dont feel confident about going through other lessons if I will be learning inorrects answers there also. Can you please fix so I can give a better review?

CMO187265 about Mathemagics