A PowerPoint demonstration of adding 9 to 2 digit numbers by adding 10 and then subtracting 1.
Adding 9 by compensating
A very useful resource which shows and explains very clearly the concept of adding 10 and subtracting 1 to add 9. Thanks for sharing.
adding 9 visually
Hi - I thought this was lovely. Supported what I had just been teaching my class about how the digits change when adding. Thanks for making the effort on our behalf!