AMC8 2017
AMC8 2017 · Q4
AMC8 2017 · Q4. It mainly tests Rounding & estimation.
When 0.000315 is multiplied by 7,928,564 the product is closest to which of the following?
0.000315 乘以 7,928,564 的积最接近下列哪个值？
(A)
210
210
(B)
240
240
(C)
2,100
2,100
(D)
2,400
2,400
(E)
24,000
24,000
Answer
Correct choice: (D)
正确答案：（D）
Solution
Answer (D): The product may be estimated as
\[ 3 \cdot 10^{-4} \cdot 8 \cdot 10^{6} = 24 \cdot 10^{2} = 2400. \]
The exact value of the product is $2497.498$.
答案 (D)：该乘积可以估算为
\[ 3 \cdot 10^{-4} \cdot 8 \cdot 10^{6} = 24 \cdot 10^{2} = 2400. \]
该乘积的精确值是 $2497.498$。
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