2021 澳洲 AMC A-MiddlePrimary 真题 答案 详解
2021-10-06 auamc auamc A-MiddlePrimary
| 序号 | 文件列表 | 说明 | ||
|---|---|---|---|---|
| 1 | 2021-A-MiddlePrimary-paper-eng-zh.pdf | 10 页 | 461.50KB | 中英双语真题 |
| 2 | 2021-A-MiddlePrimary-paper-eng.pdf | 7 页 | 201.24KB | 英文真题 |
| 3 | 2021-A-MiddlePrimary-key.pdf | 1 页 | 38.21KB | 真题答案 |
| 4 | 2021-A-MiddlePrimary-solution-eng.pdf | 6 页 | 1.21MB | 真题文字详解(英文) |
中英双语真题
2021 AUSTRALIAN MATHEMATICS COMPETITION MIDDLE PRIMARY Middle Primary Division 1-10 题，每题3分 Questions 1 to 10, 3 marks each 1. 请问这张多米诺骨牌上一共有多少个点？ How many dots are on this domino? (A) 5 (B) 7 (C) 9 (D) 10 (E) 11 2.请问14和2的差是多少？ What is the difference between 14 and 2? (A) 28 (B) 16 (C) 12 (D) 10 (E) 7 3.右图中，尼日利亚国旗上涂有白色和绿色。请问绿色部分占总面积的几分之几？ This Nigerian flag is white and green. What fraction of it is green? (A) 三分之一 (B) 四分之一 (C) 二分之一 (D) 五分之二 (E) 三分之二 (A) one-third (B) one-quarter (C) one-half (D) two-fifths (E) two-thirds 4. 234 + 100 = (A) 23400 (B) 1234 (C) 120304 (D) 334 (E) 244
英文真题
2021 AUSTRALIAN MATHEMATICS COMPETITION MIDDLE PRIMARY 7. Which number makes this number sentence true? □ - 5 = 9 (A) 0 (B) 4 (C) 12 (D) 9 (E) 14 8. Each face of this cube is divided into 4 small squares. How many small squares are there on the outside of the cube altogether? (A) 16 (B) 18 (C) 20 (D) 24 (E) 30 9. A cross country track is marked out with a number of flags as shown. How many of the flags will be on the left of the runners when they pass them? (A) 7 (B) 8 (C) 9 (D) 10 (E) 11 10. Which one of these shaded areas is the largest?
真题文字详解(英文)
34 2021 AMC Middle Primary Solutions Middle Primary Solutions 1. There are 7 dots, hence (B). 2. 14 - 2 = 12, hence (C). 3. (Also UP1) There are 3 equal parts and 2 are green, so ( \frac{2}{3} ) is green, hence (E). 4. 234 + 100 = 334, hence (D). 5. One hour is 60 minutes, half an hour is 30 minutes, and half of that is a quarter of an hour, which is 15 minutes, hence (C). 6. There are 8 divisions on the scale, and a full tank holds 80 kL. So each division indicates 10 kL. Labelling these 10, 20, ..., 80, the indicator is halfway between the 60 kL and 70 kL marker, giving a reading of 65 kL, hence (D). 7. (Also UP2) The unknown number is 5 more than 9, which is 14, hence (E). 8. Alternative 1 A cube has 6 faces, so there are ( 6 \times 4 = 24 ) small squares in total, hence (D). Alternative 2 We can see 12 squares on the three faces shown in the diagram. There are another 12 squares on the three hidden faces, so there are ( 12 + 12 = 24 ) squares in total, hence (D). www.amt.edu.au
