Lightning Calculation by 9-Digit Number/Examples/577,831,345
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Example of Lightning Calculation by 9-Digit Number
The showman announces he will instantly multiply any given $9$-digit number by $142 \, 857 \, 143$.
The given $9$-digit number is $577 \, 831 \, 345$.
Thus by division by $7$:
82,547,335,082,547,335 ------------------------ 7)577,831,345,577,831,345
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $142,857$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $142,857$