Latif's Year Code Trainer
Memorize all 100 year codes in under 15 minutes.
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Target Practice Range (Years)
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Hint
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Quick Method
Find nearest lower Base20 year
Take Base20 code
Find Remainder
Add Remainder code
Reduce mod 7
* For faster speed, Memorize 5 Base20 Codes and 20 Remainder Codes. Add them both once for any Year. If needed, keep doing Mod 7 for number larger than 7. That's all. You never leave addition beyond 11, and any math beyond 19!
Year Code = Base20 Code + Remainder Code (mod 7)
73 → ?
Base20 = 60
Base Code = 5
73 − 60 = 13
Remainder Code = 2
5 + 2 = 7
7 mod 7 = 0
Answer = 0
Base20 Year
Code
00
0
20
4
40
1
60
5
80
2
Rem Year
Mod7
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Code
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