In this lesson we take a look at how we are able to use variables with math operators in order to calculate a new value for that variable. When we use the let keyword to declare a variable, we are able to use mathematical assignment operators to quickly add, subtract, multiply, or divide a value from our variable. Instead of writing a long hand statement like x = x + 10 we are able to write it shorthand by saying x += 10 and this would accomplish the same thing. This same concept can be applied when subtracting, multiplying and dividing variables and it will work just as well by only switching our math operator. We see examples for addition, subtraction, multiplication, and division in this video. Understanding Mathematical Assignment Operators with variables is a key concept in understanding JavaScript and many other programming languages!
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