Case
Class distraction

I once had a student who was a constant distraction to the class. He would always sit in the back and not pay attention and refuse to do his work while making noises to distract the other students. He would sometimes throw paper balls while I was teaching. No matter how many times I sent him out or gave him consequences, nothing seemed to affect him. He was at risk of failing the third grade and having to repeat it because he would not do any work? what are some things I could do with this student?

Solution #1
These cases are tough. Try to catch the student "being good" even if it is something minor, and praise him. Find some small rewards that he would like and reward him at the end of the day for improvements. This many not fully solve the problem over night but it will certainly be helpful and help bring about improvements. Most kids, even kids like the one you described, love praise and positive feedback.
Solution #2
Yes, I agree. Praise him for his good behavior. Since consequences don't seem to be working well, try setting behavior goals. When he reaches these goals, reward him. Get to know the student - their hobbies, interests, etc. Find out what kind of reward you can get him to work for and use it to your advantage.
Solution #3
I have found that a great way to motivate students to complete their work is to involve them in class. In the past, I have asked students to help us with a question. I gave them a heads up that we (the class) will need their help on the next question to give them a chance to prep, and then had them help solve a question. Also, using their name in a word problem or giving positive praise for something they did to the rest of the class can help increase motivation.
Solution #4
Establishing behavior goals or a BIP could be a great thing to implement in the classroom. Something I have done in the past is have the student carry a behavior folder around and for each class the teacher or teachers would rate the behavior. If certain points were earned by the end of the week, the student can choose something from the reward menu.
Solution #5
I would give the student praise for good behavior and encourage him to participate in class discussions. Sometimes finding something that peaks the student's interest can make leaps and bounds difference in the student who wants to pay attention.