2018 澳洲 AMC A-MiddlePrimary 真题 答案 详解

中英双语真题

1-10 Questions, 3 marks each
Questions 1 to 10, 3 marks each

1. 请问将4加倍等于多少?
   What is double 4?
   (A) 2 (B) 3 (C) 8 (D) 12 (E) 24

2. 请问下列哪一项的图案内恰有10个点?
   Which pattern has exactly 10 dots?
   (A) (B) (C) (D) (E)

3. 请问下列哪一项跟6个十与3个一相等
   Which of the following is the same as 6 tens and 3 ones?
   (A) 六十三 (B) 六加三 (C) 三十六 (D) 六百零三 (E) 六十一
   (A) sixty-three (B) six and three (C) thirty-six (D) six hundred and three (E) sixty-one

4. 当我将11加上另一个数，所得到的和为19。请问此另一个数是什么?
   When I add 11 and another number, I get 19. What is the other number?
   (A) 7 (B) 8 (C) 9 (D) 10 (E) 11

5. 请问这枚硬币的直径是什么?
   What is the diameter of this coin?
   (A) 20 mm (B) 21 mm (C) 22 mm (D) 25 mm (E) 30 mm

6. 请问下列哪一项内的数最接近208?
   Which one of these numbers is closest to 208?
   (A) 190 (B) 200 (C) 205 (D) 210 (E) 218

英文真题

Middle Primary Division
Questions 1 to 10, 3 marks each

1. What is double 4?
   (A) 2 (B) 3 (C) 8 (D) 12 (E) 24

2. Which pattern has exactly 10 dots?
   (A) (B) (C) (D) (E)

3. Which of the following is the same as 6 tens and 3 ones?
   (A) sixty-three (B) six and three (C) thirty-six (D) six hundred and three (E) sixty-one

4. When I add 11 and another number, I get 19. What is the other number?
   (A) 7 (B) 8 (C) 9 (D) 10 (E) 11

5. What is the diameter of this coin?
   (A) 20 mm (B) 21 mm (C) 22 mm (D) 25 mm (E) 30 mm

真题文字详解(英文)

Solutions – Middle Primary Division
1. 4 + 4 = 8, hence (C).
2. A = 3 × 3 = 9, B = 2 × 4 = 8, C = 2 + 3 + 2 = 7, D = 4 + 4 = 8, E = 5 + 5 = 10, hence (E).
3. 6 tens is sixty, and 3 ones is three, so sixty-three, hence (A).
4. 19 - 11 = 8 so 11 + [8] = 19, hence (B).
5. The diameter is 5 mm past 20 mm, making 25 mm, hence (D).
6. (Also UP1) 208 is between 205 and 210. Of these, the distance to 205 is 3 and the distance to 210 is 2. Therefore 210 is closer, hence (D).
7. (Also UP4, J4) The back of the necklace will look like the mirror image of the front of the necklace. So each letter will be mirrored, and the order of the letters will be reversed:
KATE | ƎTAX
front back
hence (A).
8. Parliament House tours leave at 8.30, 8.45, 9.00, 9.15, 9.30, 9.45, and so on. National Museum tours leave at 8.30, 8.50, 9.10, 9.30, 9.50, and so on. So tours leave at the same time at 8.30, 9.30, 10.30, and so on, which is every 60 minutes, hence (E).
9. The number of votes for fish, dogs and rabbits in total is 4 + 14 + 3 = 21. So there were 29 - 21 = 8 votes for cats, hence (D).