**Addition** is the “putting together” of two groups of objects and finding how many in all. **Subtraction** tells “how many are left” or “how many more or less.”

We say **addition** and **subtraction** are inverse operations because one operation can “undo” the other operation. (www.eduplace.com)

In an **addition **equation, **addends **are the numbers that are added together to give a sum. In a **subtraction** equation, the **subtrahend** is taken away from the **minuend** to give a difference. (kids.britannica.com)

**PEMDAS** is an acronym for the words parenthesis, exponents, multiplication, division, addition, subtraction. Given two or more operations in a single expression, the order of the letters in PEMDAS tells you what to calculate first, second, third and so on, until the calculation is complete. If there are grouping symbols in the expression, PEMDAS tells you to calculate within the grouping symbols first. (study.com)

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