Mathematics - Addition and Subtraction - Subtraction within 20 - Countdown Challenge

Start at a teen number (e.g., 16). Show the student subtracting small amounts in a story: '16 candies, you eat 3, you give away 4, you drop 2. How many left?' Break into steps with multiple choice at each step. 4 mini-stories, each involving 2-3 subtractions from a number ≤20. The goal is to see sub