What did I do wrong? From the 2014 practice STAAR math test. (6th grade)?

Hello, I am working on the 2014 STAAR practice test. I got it from the government site. I need help with 7 questions. I already have the answer sheet, so that's not the situation. I need to know how to work the math problems. Here is the link below of the test. I have been trying to upload the pictures of my... show more Hello,

I am working on the 2014 STAAR practice test. I got it from the government site. I need help with 7 questions. I already have the answer sheet, so that's not the situation. I need to know how to work the math problems. Here is the link below of the test. I have been trying to upload the pictures of my actual work. But Yahoo won't let me. If I figure out how I'll update it. Hopefully that makes it easier for ya'll.

http://tea.texas.gov/WorkArea/DownloadAsset.aspx?id=25769814947

Questions I got wrong:

10: I choose J
11: A
13: B
14: J
16: I got 220. I really don't know how to do this one. :/
17: A
18: G

Please tell me how you got the answers. Thank you so much!
3 answers 3