Card clutter app

The card clutter app has 14 levels of increasing difficulty.  The basic Idea is that students rearrange the cards into increasing order.  If you tap the cards in the correct order, the card flies off the table.

The first level is all positive numbers and quite easy but by level 8, the numbers are in mixed form and much harder.  

Just for the fun of it, I just started tapping cards in any order to see what the app would do and it throws up a screen telling you time is up and shows the correct answer so students cannot just do anything.

Although the premise seems quite simple, it is working student number sense and would work over a number of grades. I see using this with my high school students to improve their number sense as many still have not developed their number spence to the extent it should be.