We can manipulate numbers by combining them with operators to form
mathematical expressions, and by calling built-in functions to
perform complex mathematical operations.

x = 3 * 5; // Assign the value 15 to x
x = 1 + 2 - 3 / 4; // Assign the value 2.25 to x
x = 56;
y = 4 * 6 + x; // Assign the value 80 to y
y = x + (x * x) / x; // Assign the value 112 to y