Final answer:
Malcolm should remember to show his work during math tests to demonstrate his understanding and to ensure he receives full credit for his answers.
Step-by-step explanation:
Malcolm is skilled at mental math but for math tests, it is important for him to show his work so he doesn't get points taken off. During exams, instructors often look for the process and steps taken to solve a problem, not just the correct answer. By showing his work, Malcolm demonstrates his understanding of the mathematical procedures and concepts, which can be critical in securing full credit for his responses. Remembering to write down calculations and apply mathematical knowledge to new situations are important strategies for successful test-taking.