Will Two Of A .1 Equal A Pont 2 For

Will two of a .1 equal a pont 2 for clodine my daughter takes .1 and she has to take one and a half but its not working and I noticed the .2 works for her but as of right now she's out but has two of her .1 can I give that or will it not equal the same as the .2? I wasn't for sure so I wanted to ask