Powershell include powerfull math operators
$x= 100
++ = add 1 to your variable. Ex: $x++ = 101
— = substract 1 to your variable. Ex. $x– = 100
+= adds the value to value to the variable. Ex. $x += 10 = 110
*= multiply the value of the variable times the specified value. Ex. $x *= 10 = 1010
/= devide the value of the variable by the value specified. Ex $x /= 10 = 101
Concatenation
You can use the += to concatenate strings.
$a = “Hello”
$a += ” World”