2015 澳洲 AMC B-UpperPrimary 真题 答案 详解

中英双语真题

Elementary School High Grade Test 1-10 questions, 3 points each
1. What does the number 1 represent in 2015?
(A) One (B) Ten (C) One hundred (D) One thousand (E) Ten thousand

1. How much is 10 twenty-cent coins worth?
   (A) 1 yuan (B) 2 yuan (C) 5 yuan (D) 20 yuan (E) 50 yuan

2. What temperature is shown on the thermometer?
   (A) 25°C (B) 38°C (C) 27°C (D) 32°C (E) 28°C

3. What number should be filled in the blank so that the equation is correct?
   19 + 45 = 20 + □
   (A) 34 (B) 44 (C) 46 (D) 64 (E) 84

4. Which of the following numbers is the largest?
   (A) 1.3 (B) 1.303 (C) 1.31 (D) 1.301 (E) 1.131

英文真题

Upper Primary Division Questions 1 to 10, 3 marks each 1. What does the digit 1 in 2015 represent? (A) one (B) ten (C) one hundred (D) one thousand (E) ten thousand 2. What is the value of 10 twenty-cent coins? (A) $1 (B) $2 (C) $5 (D) $20 (E) $50 3. What temperature does this thermometer show? (A) 25° (B) 38° (C) 27° (D) 32° (E) 28° 4. Which number do you need in the box to make this number sentence true? 19 + 45 = 20 + [ ] (A) 34 (B) 44 (C) 46 (D) 64 (E) 84 5. Which number has the greatest value? (A) 1.3 (B) 1.303 (C) 1.31 (D) 1.301 (E) 1.131

真题文字详解(英文)

Solutions – Upper Primary Division 1. The second column from the right is the tens column, hence (B). 2. There are 5 coins for every dollar, and so 10 coins give $2, hence (B). 3. Each mark on the scale represents 1°, so the liquid is up to 28°, hence (E). 4. (Also MP8) Increasing the 19 to 20 requires that we decrease the 45 to 44, hence (B). 5. The numbers in order are 1.131 < 1.300 < 1.301 < 1.303 < 1.310, hence (C). 6. Alternative 1 The perimeter of A is 12, of B is 10, of C is 12, of D is 12 and of E is 12, hence (B). Alternative 2 As each shape is made up of 5 equal squares, the one with the least perimeter must be the one with the most number of edges in the interior, hence (B). 7. The picture has 10 rows of 12 dinosaurs. Simon has halved the number in each row, which is correct. Carrie has halved the number of rows, which is correct. Brian has divided by two after multiplying, which is correct. Rémy has divided the number of rows by two before multiplying, which is correct, hence (A). 8. As the number in the box with the X is common to both the row and column, from the remaining numbers 1, 5 and 9, we have to pick two so that 3+ one of them equals 7+ the other. There are two possibilities, 3 + 9 = 7 + 5 and 3 + 5 = 7 + 1, and then the middle number is 1 in the first case and 9 in the second case. Sum = 13 Sum = 17 hence (E). 2015 AMC - Upper Primary Solutions 38