These would make fantastic rewards for your little students!
I’ve made a printable you can use to make your own too:
That's me up there. I'm the Mom. I change diapers, brush teeth, and kiss boo boo's. I've got four little blessings; Sissy (8), Bubba (6), Monkey (2), and Freckles (9mo). Our days are filled. Sometimes even chaotic. But we make it work.
When I get a few extra minutes,
I do this blog thing.Subscribe: 
Notebooking Success!
a complete manual for implementing notebooking in your homeschool.
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Curriculum We Love….
So, how’d you make the scratch off part?