Divide numbers up to 4 digits by a two-digit number using the formal written method of short division where appropriate, interpreting remainders according to the context

What this means, in plain words

A columnar method is the written layout where digits are lined up in their place value columns and worked one column at a time.

A remainder is what is left over when one number will not divide into another exactly.

A digit is one of the ten symbols, 0 to 9, that all numbers are written with.