With Christmas coming up very soon this is the final set of pages in our mini series on subtraction for year 2, which looks at subtracting a pair of multiples of 100. They show how important it is for children to learn their number bonds to 10, that is, they should know off by heart all possible additions and subtractions of single digits. Knowing this makes subtracting whole hundreds very easy, eg knowing that 8 - 3 is 5 means you can easily work out that 800 - 300 is  500. Subtracting whole hundreds