AMC 8 1988 Problem 8
AMC8 1988 年第 8 题
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Betty used a calculator to find the product . She forgot to enter the decimal points. The calculator showed 19200 . If Betty had entered the decimal points correctly, the answer would have been
Betty 用计算器求乘积 。她忘记输入小数点。计算器显示 19200。如果 Betty 正确输入了小数点，答案应该是
- A.0.0192
- B.0.192
- C.1.92
- D.19.2
- E.192
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
Betty calculated 75×256 = 19200, when she should have calculated .
Since 0.075 has 3 decimal places and 2.56 has 2 decimal places, the decimal point in the product should be moved 3+2=5 places to the left. Therefore, the correct product is .19200 =.192.
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