2008 袋鼠数学 C-Benjamin 真题 答案 详解

英文真题

International Kangaroo Mathematics Contest 2008
Benjamin Level: Class (5 & 6)
Max Time: 2 Hours

3-point problems
1) Which is the smallest?
A) 2 + 0 + 0 + 8 B) 200/8 C) 2 x 0 x 0 x 8 D) 8 + 0 + 0 - 2

2) By what can be replaced to have:
x = 2 × 2 × 3 × 3 ?
A) 2 B) 3 C) 2 × 3 D) 2 × 2

3) Javed likes to multiply by 3, Parvaiz likes to add 2, and Naveed likes to subtract 1. In what order should they perform their favorite actions to convert 3 into 14?
A) JPN B) PJP C) JNP D) NJP

4) To make the equality 1 + 1*1 - 2 = 100 correct, we should replace with
A) + B) - C) 0 D) 1

5) Numbers 2, 3, 4 and one more number are written in the cells of a 2 × 2 table. It is known that the sum of the numbers in the first row is equal to 9, and the sum of the numbers in the second row is equal to 6. The unknown number is
A) 5 B) 6 C) 7 D) 8

6) Before the snowball fight, Ali had prepared a few snowballs. During the fight, he made another 17 snowballs and threw 21 snowballs at the other boys. After the fight, he had 15 snowballs left. How many snowballs had Ali prepared before the fight?
A) 53 B) 33 C) 23 D) 19