A teacher has 1256 craft sticks she divides them equally among nine students how many craft sticks does each student get how many craft sticks are left over

Pls! does anybody know a shortcut for answering these types of questions in the future?

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?