Many hundred squares (my own included) offer lots of options for using them for different things. Most of the time they are used for a specific purpose such as teaching addition and all of the options needlessly clutter up the screen. This iPad, Android and IWB compatible teaching resource is specifically for teaching addition. It therefore is less cluttered and has features designed to aid this task. Select a start number by touching the board and then show adding tens and units by touching the T and U squares. The calculation can be shown in horizontal or column format.
A supporting resource for children to practise the skills taught with this resource is Addition Square Challenge.