Question

Betty 用计算器计算乘积 $0.075 \times 2.56$ 。她忘了输入小数点，计算器显示 $19200$ 。如果 Betty 正确输入小数点，答案应为

Betty used a calculator to find the product $0.075 \times 2.56.$ She forgot to enter the decimal points. The calculator showed $19200.$ If Betty had entered the decimal points correctly, the answer would have been

$.0192$

$.192$

$1.92$

$19.2$

$192$

答案：B

知识点：小数位值

难度评级：800

解答：

因数 $0.075$ 和 $2.56$ 分别有 $3$ 位和 $2$ 位小数，共 $5$ 位。

从 $19200$ 右边数 $5$ 位放小数点，得到 $0.19200 = .192$ 。

所以正确答案是 B。

The factors $0.075$ and $2.56$ have $3$ and $2$ decimal places, for a total of $5.$

Placing the decimal point $5$ digits from the right of $19200$ gives $0.19200 = .192.$

Thus, the correct answer is B .

1988 AMC 8 第 8 题

答案：B

难度评级：800

解答：

其他年份的第 8 题