​Stuart's best golf score is 4 under​ par, or 4. He wants to beat this score by an additional 3 strokes under par. With one hole​ remaining, Stuart is 5 under​ par, or 5. What must his score be on the last hole to beat his best​ score? Explain your answer.
Stuart needs a score of ___ strokes under​ par, or ___​ on the last hole in order to score ___ strokes under​ par, or ___ ​, overall.