You can use the Modulus Operator ‘%’ in a few ways that can be very helpful depending on what you are trying to achive. Modulus can be thought of as a remainder when one number divides another. For instance 5 Mod 3 is 2 and 5 Mod 6 is 5.

#5 Divided by 3 leaves a remainder of 2 5 % 3 2 #5 Divided by 6 leaves a remainder of 5 5 % 6 5

**Find Multiples of x**

To find multiples of a given number you can simply find all numbers in an array that have a remainder of 0 when divided by x

$arr = {Array](1..100) #Find all multiples of 3 $arr | ?{$_ % 3 -eq 0}

**Find every xth item**

When not working with numbers you can also use % to find every 2nd, 3rd, … xth item in an array by using $i as a counter. Bare in mind 0 is the first element of an array which can become confusing in this example

#Get the first value and every xth value thereafter $arr = 'one','two','three','four','five','six','seven','eight','nine','ten' $i = 0 $x = 2 While ($i -lt $arr.Length){ if(($i % $x) -eq 0){ $arr[$i] } $i++ } one three five seven nine