AMC8 1998

AMC8 1998 · Q7

AMC8 1998 · Q7. It mainly tests Decimals.

$100 \times 19.98 \times 1.998 \times 1000 =$

$100 \times 19.98 \times 1.998 \times 1000 = $

(A) $(1.998)^2$ $(1.998)^2$

(B) $(19.98)^2$ $(19.98)^2$

(D) $(1998)^2$ $(1998)^2$

(E) $(19980)^2$ $(19980)^2$

Answer

Correct choice: (D)

正确答案：（D）

Solution

Use the associative property to group as follows: $(100 \times 19.98) \times (1.998 \times 1000) = 1998 \times 1998 = (1998)^2$.

使用结合律分组如下：$(100 \times 19.98) \times (1.998 \times 1000) = 1998 \times 1998 = (1998)^2$。

Topics

AR.002 Decimals