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Scripter Javascript Tutorial

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23 Addition, Subtraction, Multiplication, Division

MDN:

These operators work exactly as expected and will be used extensively in most scripts. Using the variables in the Assignment section:

const CHROMATIC_SCALE = 12;
var tonic = 60;
var addition = tonic + CHROMATIC_SCALE; // 72
var subtraction = tonic - CHROMATIC_SCALE; // 48
var multiplication = tonic * CHROMATIC_SCALE; // 720
var division = tonic / CHROMATIC_SCALE; // 5