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Java Games: Matching, concentration, word search, and flashcards.

Adding Doubles and Doubles plus One

AB
1 + 1 =2
2 + 2 =4
3 + 3 =6
4 + 4 =8
5 + 5 =10
6 + 6 =12
1 + 2 =3
2 + 3 =5
3 + 4 =7
4 + 5 =9
5 + 6 =11
6 + 7 =13