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For 355/113 you get error correction - if the answer you get isn't around 3.14 you misremebered.

Ok, now you’re memorizing 11 digits, including 3.14, to get 8 error-corrected digits.

Edit: changed 7 to 8, my mistake

Most people have the 3.14 down.

Ok, then you’re memorizing seven additional digits to get four additional digits and error correction…