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Flashcards reviewing the addition of single and double digits paired with themselves from 1 to 10.
1+11+11+1
222
2+22+22+2
444
3+33+33+3
666
4+44+44+4
888
5+55+55+5
101010
6+66+66+6
121212
7+77+77+7
141414
8+88+88+8
161616
9+99+99+9
181818
10+1010+1010+10
202020