# A patient had three physical therapy sessions this week. The first was 15 minutes, the second was 25 minutes, and the third was 30 minutes. How much time did the patient spend in therapy this week?

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** 15 + 25 + 30 = 70 minutes total spent in therapy this week**

This question was solved using addition. Addition is the process by which two or more values are combine to find a total amount. In story problems, key words may indicate that addition is required to utilized. Some of these key words include: total, join, both, together, sum, plus, increase, and/or add.

Addition is one of four basic operations in mathematics. The other three basic operations of mathematics are subtraction, division, and multiplication.

There is a proper order to follow when given a multi-step mathematic problem that include multiple operations. This order is can be remembered using the acronym PEMDAS. The acronym stands for parenthesis, exponents, multiplication, division, addition, and subtraction. Here, the order of operations is explained in greater detail.