Question

$0.000315$ 乘以 $7,928,564$ 的乘积最接近下列哪一个数？

When $0.000315$ is multiplied by $7,928,564$ the product is closest to which of the following?

$210$

$240$

$2,100$

$2,400$

$24,000$

知识点：估算

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可以近似为 $\begin{align*} (3 \cdot 10^{-4})(8 \cdot 10^6) &= 24 \cdot 10^2 \\ &= 2400. \end{align*}$

所以正确答案是 D。

We can approximate the product as $\begin{align*} (3 \cdot 10^{-4})(8 \cdot 10^6) &= 24 \cdot 10^2 \\ &= 2400. \end{align*}$

Thus, D is the correct answer.