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Base 21 Addition Table

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In mathematics, a base N addition table defines the addition operation for numbers written in a base-21 number system. This page shows the base 21 addition table — every row header, column header, and sum below is written in base 21, not decimal. Print it directly from the page using the print button on the table.

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Base 21 Addition Table

Base 21 Addition Table
+ 021 121 221 321 421 521 621 721 821 921 A21 B21 C21 D21 E21 F21 G21 H21 I21 J21 K21 1021
021 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K 10
121 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K 10 11
221 2 3 4 5 6 7 8 9 A B C D E F G H I J K 10 11 12
321 3 4 5 6 7 8 9 A B C D E F G H I J K 10 11 12 13
421 4 5 6 7 8 9 A B C D E F G H I J K 10 11 12 13 14
521 5 6 7 8 9 A B C D E F G H I J K 10 11 12 13 14 15
621 6 7 8 9 A B C D E F G H I J K 10 11 12 13 14 15 16
721 7 8 9 A B C D E F G H I J K 10 11 12 13 14 15 16 17
821 8 9 A B C D E F G H I J K 10 11 12 13 14 15 16 17 18
921 9 A B C D E F G H I J K 10 11 12 13 14 15 16 17 18 19
A21 A B C D E F G H I J K 10 11 12 13 14 15 16 17 18 19 1A
B21 B C D E F G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B
C21 C D E F G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C
D21 D E F G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D
E21 E F G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E
F21 F G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
G21 G H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G
H21 H I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G 1H
I21 I J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G 1H 1I
J21 J K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G 1H 1I 1J
K21 K 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G 1H 1I 1J 1K
1021 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1G 1H 1I 1J 1K 20

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