This is a simple memory game to help children practice their Rainbow 10 Facts (also known a Friendly 10s). It would work great as a math center or extension activity for early finishers.
Each pair of addends that equal 10 are in matching colors to make it easy for the students to self-correct their work:
0 + 10 = blue
1 + 9 = violet
2 + 8 = maroon
3 + 7 = green
4 + 6 = orange
5 + 5 = green
Eventhough these cards are meant to be printed double sided so that they are not "see though", it is advisable to print them onto thicker paper (such as cardstock).
It is a good idea to print each set of cards onto a different color of paper. This will help prevent multiple copies of the game from becoming mixed-up.