Subtraction in Year 4 Our latest pages on subtraction are designed to help children use their knowledge to subtract two 4-digit numbers. Using place value grids, there are no exchanges to be made when doing this; the key idea is to concentrate on the correct place value for each digit. We have a great selection of subtraction worksheets using both mental and written methods. The main aim for the year is to ‘subtract numbers with up to 4-digits using the formal written method of columnar subtraction’. Go to Year 4 Subtraction