Choose the correct standard form in the international system of these expansions.

$300000000+400000+70000+6000+500+10+9$

Multiply the given number.

$519\times 300$

Estimate to the nearest hundreds by rounding the first factor up and the second factor down.

$321\times 587$

Multiply the following numbers.

$213\times 370$

Solve using the column method.

$\begin{array}{ccccc}& 8& 0& 6& 5\\ \times & & & & 4\\ & & & & \end{array}$

Multiply

$206\times 507$

Estimate the product by rounding to the nearest hundreds.

$693\times 208$

Multiply

$397\times 67$

Multiply.

$1498\times 90$

Estimate to the nearest ten by rounding the first factor up and the second factor down.

$77\times 62$

Multiply the following numbers.

$996\times 109$

Solve using the column method.

$\begin{array}{ccccc}& 8& 5& 6& 0\\ \times & & & & 7\\ & & & & \end{array}$

Multiply

$647\times 834$

Multiply the following numbers.

$363\times 850$

Solve using the column method.

$\begin{array}{ccccc}& 4& 2& 3& 3\\ \times & & & & 9\\ & & & & \end{array}$

Multiply

$837\times 328$

Estimate to the nearest ten by rounding the first factor up and the second factor down.

$19\times 29$

Multiply

$8251\times 40$

Estimate the product by rounding to the nearest hundreds.

$466\times 388$

Multiply the following numbers.

$827\times 107$

Solve using the column method.

$\begin{array}{ccccc}& 9& 8& 4& 2\\ \times & & & & 5\\ & & & & \end{array}$