About This Lesson
What happens when you find the difference between 62 - 26 = ? or 21 – 12 = ? (Reversing two digit numbers.) Children can use and apply strategies for subtraction. Ask questions to encourage children to explain their mathematical thinking; such as; Can you see a pattern? Aligned with Common Core State Standards: 2.OA.1, Operations and Algebraic Thinking; 3.OA.9, Operations and Algebraic Thinking.
Great set of slides for introducing investigations and problem solving. Encourages paired/group discussion and reasoning which is often hard to capture for APP.