Review all of the data from your science experiment. Highlight the important information. You should already have a hypothesis written. Condense it if necessary to fit the word count. Highlight any numbers or results in the data. Review your steps for conducting the experiment. Turn those pieces of information into brief statements to fit under each of the five abstract sections, keeping it to the point without focusing too much on word count. If your rough draft goes over the limit, go back through to cut out extra words, such as "very" or "many." Have someone else read the abstract to ensure it is easy for anyone to understand, even someone not familiar with the project.