It is often asked why we teach things so differently from the way we as adults learned growing up. The answer is simple. We need to teach the **WHY** before we teach the **HOW**. We want to give student’s lot of options and flexibility when it comes to solving problems. Each child learns differently.

**mental strategies and algorithms based on place value and properties of operations.**

**based on place value, properties of operations, and/or the relationship between addition and subtraction**.

**Base Ten Model**

**Expanded Form Method**

__+ 40+5__

**Number Line Model**

**Standard Algorithm**

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