Mathematical Fluency

Addition Matrix

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0123456789101112131415
12345678910111213141516
234567891011121314151617
3456789101112131415161718
45678910111213141516171819
567891011121314151617181920
6789101112131415161718192021
78910111213141516171819202122
891011121314151617181920212223
9101112131415161718192021222324
10111213141516171819202122232425
11121314151617181920212223242526
12131415161718192021222324252627
13141516171819202122232425262728
14151617181920212223242526272829
15161718192021222324252627282930
16171819202122232425262728293031
17181920212223242526272829303132
18192021222324252627282930313233
19202122232425262728293031323334
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