Lightning Calculation by 9-Digit Number/Examples/577,831,345

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