Ask your friend to write any two-digit number and multiply it manually by 3367.
You will always be able to get the answer before him/her without a calculator.
Example: If your friend chooses 53, then write 535353 and divide it by 3.
Thus, 535353/3 = 178451
Check: 53 x 3367 = 178451
Trick: Write the two-digit number thrice and divide it by 3.
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