Emma always learned that when you multiply by a power of ten, all you need to do is add a zero. She used that trick to solve the following problems: 345 x 10 = 3,450
4,789 x 100 = 478,900
5.6 x 10 = 5.60

Emma’s sister told her that her “trick” doesn’t work, and that 5.6 x 10 is NOT 5.60.
Which girl is correct? How do you know?

help meee plsss you smart people