The main objectives of this lesson are to help students develop fluency in subtracting two-digit numbers within 100, understand the concept of regrouping, and apply different strategies for subtraction.
For this lesson, you will need place value models (such as base-ten blocks or place value rods), place value cards, and an exit slip for assessment purposes.
At the end of the lesson, you can use an exit slip to quickly assess student understanding. Discussing their answers with them will help identify any misconceptions or areas where they may need additional support.