## Reflection: Lesson Planning Getting Bigger and Smaller - Section 2: Teaching the Lesson

Second graders are still developmentally at a stage where concrete models and pictures help them to grasp mathematical concepts. Common Core standard 2.NBT.7 states that students should be able to add and subtract within 1000 using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Too often students memorize number facts without understanding underlying concepts. In this lesson I wanted even the students who can read and write numbers in the hundreds to stop and build those numbers to solidify their understanding of the importance of place value. I find that letting students "play" with blocks and other manipulatives, even when they can perform the operation, strengthens their understanding of the concept being taught.

Using Models to Solve Problems
Lesson Planning: Using Models to Solve Problems

# Getting Bigger and Smaller

Unit 2: Adding and Subtracting the Basics
Lesson 7 of 18

## Big Idea: Students are extending their understanding of the base ten system by using its properties to add, subtract and compare two and three digit numbers.

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55 minutes

### Beth McKenna

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