AMC 8 1989 Problem 3
AMC8 1989 年第 3 题
百分比★☆☆☆☆
Which of the following numbers is the largest?
以下哪个数最大？
- A.0.99
- B.0.9099
- C.0.9
- D.0.909
- E.0.9009
正确答案 · Correct Answer
A
解析 · Solution
Solution 1
When written with 4 decimal places, the answer choices are.9900,.9099,.9000,.9090, and.9009. So.99 must be greater than all the other answer choices, whose first two decimal places are.90.
The answer choices sorted from largest to smallest are .99>.9099>.909>.9009>.9, so choice.99 is the largest.
If.9 is subtracted from each answer choice, the answer choices become.09,.0099, 0,.009, and.0009. Of these, all except.09 are less than.01, so.99 is the largest.
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