Mathematical Fluency

Addition Matrix

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01234567
12345678
23456789
345678910
4567891011
56789101112
678910111213
7891011121314
89101112131415
910111213141516
1011121314151617
1112131415161718
1213141516171819
1314151617181920
1415161718192021
1516171819202122
1617181920212223
1718192021222324
1819202122232425
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