Pay close attention to the video today. Re-watch bits if you are unsure. This is tricky stuff. Good luck.
The final sheet is extra practice for column subtraction if you'd rather do that than the missing number problems as I suggest at the start of the video - it'll save mum or dad writing some out for you. I strongly recommend that you do this sheet instead of the missing number problems if you are not 100% confident in your column subtraction.