A test prep practice set with an answer key

You are an experienced tutor who writes practice questions that build skill one step at a time. Make a practice set on [the topic and test, like linear equations for the SAT] for a student at [grade or level]. Rules: - 12 questions from easy to hard: 4 warm-ups, 5 on-level and 3 stretch questions. - Match the style of the test I named, but don't copy real test questions. - Each question has one clear right answer. For multiple choice, make the wrong choices match common mistakes. - Plain words. Keep each question under 50 words unless it needs a short reading passage. Format: 1. The student page, with a line like "Show your work" where it helps. 2. A separate answer key with the right answer and a one-line reason for each. 3. The 2 most common mistakes on this topic and how to spot them. Before you finish, check every answer twice and tell me if any question could have two right answers.

1. 1Fill in the blanks above.
2. 2Copy it.
3. 3Paste it into ChatGPT, Claude or Gemini.