The following videos may help you see the written methods in action.
IXL written method questions that may support learning:
Year 3: Subtraction two digits H.1 to H.12, Subtraction three digits J.1 to J.14
Year 4: Subtraction D.1 to D.10
Year 5: Subtraction C.1 to C.7
Year 6: Addition and subtraction B.1 to B.9