Mathematical Fluency

Addition Matrix

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01234567891011
123456789101112
2345678910111213
34567891011121314
456789101112131415
5678910111213141516
67891011121314151617
789101112131415161718
8910111213141516171819
91011121314151617181920
101112131415161718192021
111213141516171819202122
121314151617181920212223
131415161718192021222324
141516171819202122232425
151617181920212223242526
161718192021222324252627
171819202122232425262728
181920212223242526272829
192021222324252627282930
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