555•99999999999

To calculate \( 555 \times 99999999999 \), you can simplify the multiplication by recognizing that \( 99999999999 = 10^{11} - 1 \), which is \( 100000000000 - 1 \).

So, the calculation can be broken down as follows:

\[ 555 \times 99999999999 = 555 \times (10^{11} - 1) = 555 \times 10^{11} - 555 \]

Now calculate \( 555 \times 10^{11} \):

\[ 555 \times 10^{11} = 5550000000000 \]

Now, subtract \( 555 \):

\[ 5550000000000 - 555 = 5549999999445 \]

Thus,

\[ 555 \times 99999999999 = 5549999999445 \]

Therefore, the answer is \( 5549999999445 \).