Ideas for more games:
Play "Concentration" again with playing cards. Players flip 2 cards and try to collect the cards that add to 10.
Play "Number Search." Draw the numbers from 0-10 on a paper over and over and over again. Make sure to write them mixed up all over the paper (like a word search). Once the paper is filled with numbers, try to find and circle numbers to group the ones that add 10. To make it more challenging, circle more than 2 numbers that would make 10 (ie. 3+2+5).