I am needing an explication to this new way of dividing please

The question given is
[tex]236\div18[/tex]Here,
The divisor
[tex]=18[/tex]And the dividend is
[tex]=236[/tex]Step 1: We begin by subtracting multiples of the divisor from the dividend
Step 2: We will keep subtracting the smaller multiples of the divisor until the remaining number is less than the divisor or zero
The remainder above is 2 while the quotient is 13.
Therefore
[tex]236\div18=13r2[/tex]Another illustration using different multiples, we will have it below
Using the example in the question, we will have
The remainder above is 2 while the quotient is 13.
Therefore
[tex]236\div18=13r2[/tex]