Lightning Calculation by 9-Digit Number/Examples
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Examples of Lightning Calculation by 9-Digit Number
Multiplication of $577 \, 831 \, 345$ by $142 \, 857 \, 143$
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