AMC8 1991

AMC8 1991 · Q3

AMC8 1991 · Q3. It mainly tests Arithmetic misc.

Two hundred thousand times two hundred thousand equals

二十万乘以二十万等于

(A) four hundred thousand 四十万

(B) four million 四百万

(D) four hundred million 四亿

(E) forty billion 四百亿

Answer

Correct choice: (E)

正确答案：（E）

Solution

Using arithmetic notation: $200,000 \times 200,000 = 40,000,000,000$ OR Using scientific notation $(2 \times 10^5)(2 \times 10^5) = 4 \times 10^{10} = 40 \times 10^9 = 40$ billion. OR Two hundred times two hundred is forty thousand. A thousand thousands is a million. The answer is forty thousand millions, or forty billion.

使用算术记号：$200,000 \times 200,000 = 40,000,000,000$ 或使用科学记号 $(2 \times 10^5)(2 \times 10^5) = 4 \times 10^{10} = 40 \times 10^9 = 40$ 十亿。或两百乘两百是四万。一千个一千是一个百万。答案是四万百万，即四百亿。

Topics

AR.015 Arithmetic misc