Plan your answer. Read the problem carefully, then reread the passage or look at math problem again. What is the problem asking for? BCRs are designed to be shorter responses, so your answer needs to fit in the allotted space. Decide the important details of your answer before you begin writing.
Answer the exact question in your first sentence. Is it a yes/no question that you'll need to explain your reasoning for? Is it a math problem asking for how you would solve something? Write your opinion or first step in that first sentence. This sentence serves as a topic or introductory sentence that ties your answer together into one cohesive paragraph.
Use examples from the passage, problem, or real life. If you believe the answer is 'no', explain why. Use specifics that you read in the passage and use any descriptions that you found in the problem. If the question is "How many small oranges can be used in a recipe calling for two large oranges, if the small oranges are half the size of the large?" One possible answer is: "Four smaller oranges can be used instead of the two large oranges. The smaller oranges are half the size of the larger oranges and two halves make one whole. So, using four smaller oranges is the same as using two large oranges."
Reread the passage, problem and your answer. Ensure that you have answered the question that is required. If it's an opinion and question, ensure that you state what you believe. If it's a math question make sure you've solved the problem (if the question asks you to). Be certain all your supporting details are directly related to the problem and the information you've been given.