Mathematical Fluency

Addition Matrix

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0123456789101112131415161718
12345678910111213141516171819
234567891011121314151617181920
3456789101112131415161718192021
45678910111213141516171819202122
567891011121314151617181920212223
6789101112131415161718192021222324
78910111213141516171819202122232425
891011121314151617181920212223242526
9101112131415161718192021222324252627
10111213141516171819202122232425262728
11121314151617181920212223242526272829
12131415161718192021222324252627282930
13141516171819202122232425262728293031
14151617181920212223242526272829303132
15161718192021222324252627282930313233
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