Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. O L Y M P I A D C H A M P I O N E D U C A T I O N C E N T R E Room 309-310, 8 Jordan Road, Yau Ma Tei, Kowloon, Hong Kong SAR, CHINA Tel (852) 3153 2028 / 9310 1240 Fax (852) 3153 2074 Website: www.olympiadchampion.com Email: olympiadchampion@gmail.com GUANGDONG-HONG KONG-MACAO GREATER BAY AREA MATHEMATICAL OLYMPIAD 2019 (GREATER BAY AREA REGION) Primary 2 Question Paper Time allowed: 75 minutes Instructions to Contestants: 1. Each contestant should have ONE Question Book which CANNOT be taken away. 2. There are 3 sections in this exam. Section A consists of 10 questions. Each carries 4 marks. Section B consists of 10 questions. Each carries 5 marks. Section C consists of 5 questions. Each carries 7 marks. The total number of questions is 25. Total score is 125 marks. No points are deducted for incorrect answers or empty answers. 3. NO calculators can be used during the contest. All figures in the paper are not necessarily drawn to scale. 4. This Question Book will be collected at the end of the contest. THIS Question Book CANNOT BE TAKEN AWAY. DO NOT turn over this Question Book without approval of the examiner. Otherwise, contestant may be DISQUALIFIED. All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. Section A: 1st to 10th Question (Each carries 4 marks) 1) Find the value of 25 30 35 40 45 50 55 60        . 2) Refer to the figure below, how many squares are there? Question 2 3) How many odd numbers are there from 41 to 59? (including the first and the last number) 4) Find the value of 9 4 7 2 8 8 2 3 4         . 5) Find the value of 90 87 79 97 78 89      . 6) Refer to the figure below, at least how many cubes are there? All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. Question 6 7) According to the pattern, which number should be filled into the box? 1 、 1 、 2 、 4 、 7 、 13 、 24 、 、 … 8) By observing the equation, find the number to represent the coloured area. ？  8 + 4 ＝ 6 0 All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. 9) By observing the pattern from left to right, what is the missing figure? ■、▲、■、▲、▲、★、■、▲、▲、？ 10) A bag of apple contains 6 apples. Now we have 8 children and each child will receive 9 apples. How many bags of apple do we need? Section B: 11th to 20th Question (Each carries 5 marks) 11) Refer to the figure below, what is the missing number? Question 11 12) 5 people exchange presents around a circular table. They can only exchange with one person each time. It is known that any of them cannot take the present of their own or people next to him / her after the event. At least how many times do they need to exchange with others? 13) Find the value of 16 3 2 16 9 16 0 16 4 16          . 14) Find the value of 121 123 125 127 129 131 133 135 137         . 15) There are 42 students in a class with number 1 to 42. Now a teacher is going to give 1 candy for each student. Also, there are some special rules: students can have 1 more if the 8 2 8 5 3 11 ? 7 9 All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. number is a multiple of 2, 2 more if the number is a multiple of 3, no candies if the number is a multiple of both 2 and 3. How many candies does the teacher need to prepare? 16) 31 children stand in a row from the shortest to the highest. The last child is 131cm height. Ming stands 10th from the front. It is known that no any of two children have the same height, what is the maximum height of Ming? 17) Mum’s age is 3 time of Yan’s age 10 years ago. Now Mum is 40 years old. What is the age of Yan now? 18) Refer to the figure below, how many line segments are there? Question 18 19) Refer to the puzzle, find the value of A B C   . A 1 4 3 B 7 All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. + 6 9 C 1 1 1 1 Question 19 20) Refer to the figure below, how many triangles are there? Question 20 Section C: 21st to 25th Question (Each carries 7 marks) 21) By observing the balance, how many boxes A are needed to be placed on the right side to establish the last balance? A B B B B C C ？ C C B C C C C C C All answers should be written on the ANSWER SHEET. Write down the answer in the simplest form. If the calculation result is a fraction, please write down the answer as a proper or mixed fraction, decimal figure is also accepted. Marks will NOT be given for incorrect unit. 22) Refer to the figure below, find the value of A B C   . 1 2 3 7 6 2 8 5 6 A B C 4 5 6 3 9 5 2 1 9 D E F 7 8 9 8 4 1 4 3 7 G H I 23) The sum of 9 consecutive numbers is 180. What is the largest number? 24) By observing the pattern, find the value of A B C   . 90 、3 、87 、80 、8 、72 、70 、13 、57 、A 、B 、C 25) Refer to the figure below, how many ways are there to remove 4 matches to establish the equation? Question 25 ~ End of Paper ~