AMC8 1990

AMC8 1990 · Q2

AMC8 1990 · Q2. It mainly tests Decimals.

Which digit of .12345, when changed to 9, gives the largest number?

将小数 .12345 的哪一位数字改为9，能得到最大的数？

(A) 1 1

(B) 2 2

(D) 4 4

(E) 5 5

Answer

Correct choice: (A)

正确答案：（A）

Solution

An increase in the tenth’s place gives a larger value than an increase in any of the other decimal places. Since 1 is in the tenth’s place of .12345, (A) is correct.

十分位处的增加比其他任何小数位处的增加给出的值都大。由于 .12345 的十分位处是1，因此 (A) 是正确的。

Topics

AR.002 Decimals