Subtraction with "Renaming"
If you are of a certain vintage you may have been taught to carry out subtraction sums using the "borrow and pay back" method. Whilst this method led to the correct answer it was not logical as to why it worked.
More recently subtraction is taught using the "renaming" method.
So, say you have the sum 43 -17.
Your final answer is 43 - 17 = 26.
Still not sure? Just drop in and we will go through it for you.