We have all been using the column method to subtract 3 and 4 digit numbers. Some of us started with decomposition – splitting the numbers into thousands, hundreds, tens and ones. We know how to ‘borrow’ by taking a ten, hundred or thousand….
We also used numbers with 2 decimal places – to answer money and measure problems.
We had to remember to record all the numbers correctly so that the value of the digits and the decimal point stayed correct.