The answers to algebra problems are never round numbers. They come in fractions, decimals, and irrational numbers. You can use an algebra calculator while solving the problems. It will give the answer in the right form. You should simplify the complex equations in algebra.
You can also use scientific notation to show the answer to certain complex questions. You should also try factoring as much as possible. You can take the help of teachers if there is any doubt or query in your mind.
Cross-checking will show you any mistakes you made in the steps of solving algebra problems. The habit of cross-checking the work will be beneficial to you even during the exams.