Today, I got to Gem #15.
The first item is this cute little fraction applet, called Slice the Pie.
To play the game, you hover over a circle, and click where you want the shaded part of the circle to stop. (So you could shade a tiny slice, or a giant slice)
The object of the game is to shade the amount of the pie indicated by the fraction shown. However, there aren't any partitions shown (just a blank circle). You have to use your own number sense to get as close as you can. Do you know where 2/11 is on a blank circle? 1/12? 23/30?
I love the estimation skills, the number sense, & how relative number sizes are all a part of this easy, quick, little game. I can even see using something like this when starting the unit circle. (Can you shade for pi radians? pi/4 radians?)
My first try, I scored a 49. Can you beat that?