Mathematical Fluency

Addition Matrix

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0123456789
12345678910
234567891011
3456789101112
45678910111213
567891011121314
6789101112131415
78910111213141516
891011121314151617
9101112131415161718
10111213141516171819
11121314151617181920
12131415161718192021
13141516171819202122
14151617181920212223
15161718192021222324
16171819202122232425
17181920212223242526
18192021222324252627
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