Mathematical Fluency

Addition Matrix

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012345678910
1234567891011
23456789101112
345678910111213
4567891011121314
56789101112131415
678910111213141516
7891011121314151617
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910111213141516171819
1011121314151617181920
1112131415161718192021
1213141516171819202122
1314151617181920212223
1415161718192021222324
1516171819202122232425
1617181920212223242526
1718192021222324252627
1819202122232425262728
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