Pre-Algebra Examples

$(4 \cdot 10^{7}) (2 \cdot 10^{8})$

Step 1

Multiply $4$ by $2$ .

$8 (10^{7} \cdot 10^{8})$

Step 2

Multiply $10^{7}$ by $10^{8}$ by adding the exponents.

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Step 2.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$8 \cdot 10^{7 + 8}$

Step 2.2

Add $7$ and $8$ .

$8 \cdot 10^{15}$