AMC10 2009 A
AMC10 2009 A · Q5
AMC10 2009 A · Q5. It mainly tests Arithmetic misc, Perfect squares & cubes.
What is the sum of the digits of the square of 111,111,111?
111,111,111的平方数的各位数字之和是多少？
(A)
18
18
(B)
27
27
(C)
45
45
(D)
63
63
(E)
81
81
Answer
Correct choice: (E)
正确答案：（E）
Solution
Answer (E): The square of 111,111,111 is
Hence the sum of the digits of the square of 111,111,111 is 81.
答案（E）：111,111,111 的平方是
因此，111,111,111 的平方的各位数字之和为 81。
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