1 What are you up to? (be up to) 2 Do you want to go out? (go out) 3 No, I'm not into skateboarding now. (be into) 4 Oh, come on, Jamie! There's a great film on. (come on) 5 Come round here in twenty minutes. (comeround)

Be up to: means doing something.

Go out: means to leave the place where you are and do an activity for fun.

Be into: means to be interested in something.

Come on: express something that bothers you and, at the same time, asks something from the other person.

Come round: means to return somewhere.

Explanation:

Be up to, go out, be into, come on, and come around are all phrasal verbs. Phrasal verbs consist of a verb plus an element. Their meaning is different from the one that the verb has. One phrasal verb can have different meanings, for example,  come on means to find by chance or to insinuate sexually, or to start something little by little. To know the meaning, we have to analyze the context.

at hatfield elementary school, there are 504 students in 7 classes. each class has the same number of students. what is a good estimate of the number of students in each class?