Đề thi thử amo số 1 asmo lớp 3 2020 k3vip3

TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 AMO OFFICIAL TEST 2015 – GRADE ĐỀ THI CHÍNH THỨC AMO NĂM 2015 - LỚP INSTRUCTION CHỈ DẪN Please DO NOT OPEN the contest booklet until the Proctor has given permission TIME: hour 30 minutes Attempt all 25 questions Each question scores point No points are deducted for incorrect answers Write your answers neatly in the answer sheet in the booklet PROCTORING: No one may help any student in any way during the contest No calculators are allowed All students must fill in your Name, Class and School MINIMUM TIME: Students must stay in the exam hall at least lh 15 sheet Students must show detailed working and put answers in the answer No spare papers can be used in writing this contest Enough space is provided for your working of each question TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 Question What number can replace the square to make the statement true? 11+ 12+ 13 +14 + 15 + 16 = x A ĐA: Vế trái = ( 11 + 16 ) x : = 27 x = x A A = 27 Question The figure shown at the right is made by placing cubes on top of each other with no gaps Not all cubes are visible How many cubes does the figure contain? ĐA: Question Amy chooses any number from 13 to 37 She adds 68 to it and subtracts 37 from the resulting sum Afterwards she adds 19 to the difference Finally, she subtracts original number from the sum What is the number she will get after all these operations? ĐA: Amy chọn số từ 13 đến 37 Cô cộng 68 , trừ 37 ; cộng 19 CUối trừ số ban đầu Hỏi sau phép tính kết nhận số nào? A + 68 – 37 + 19 – A = (A-A) + 68 – 37 + 19 = + 31 + 19 = 50 Question Tom is older than Jerry but younger than Ben Leonardo is older than Christopher but younger than Tom Who is the eldest of these five people? ĐA: B> T>J T> L > C  B lớn TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 Question Pablo has nickels and dimes and no other coins He has five more dimes than nickels Altogether, he has $1.40 How many nickels does Pablo have? (Note: Nickel is a coin worth of cents; Dime is a coin worth of 10 cents) ĐA: Question Find the sum of 102 + 203+304 + 405 +506 + 607 +708 + 809 + 901 ĐA : Đơn vị = +2 +3 + + = 45 đơn vị Trăm = + + + … + = 45 trăm = 4500 Tổng = 4500 + 45 = 4545 Question The number has exactly four unique factors: 1, 2, 3, and How many whole numbers less than 10 have an odd number of unique factors? ĐA: Số có ước 1,2,3,  ước  chẵn Có số nhỏ 10 có số lẻ ước? Số có ước  ước  có lẻ ước Số có ước 1,  ước  có chẵn ước Số có ước 1; ;  ước  có lẻ ước Số có ước 1;2;4;8  ước  có chẵn ước Số có ước 1;3;9  ước  có lẻ ước  Có số có số lẻ ước 1; 4; QUy luật : =1x1 ; = 2x2 ; = 3x3 VD: Có số nhỏ 30 có số lẻ ước? Các số có số lẻ ước số ; ; ; 16 ; 25 có số TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 Question In each box, the three numbers on the top row are used to obtain the number in the bottom row If the same pattern is used in each box, what is the value of N? ĐA: N =7 x + = 17 Question Pascal's Triangle is shown here, The first and last number in each row is Each of the other numbers is the sum of the two numbers diagonally above it, as shown by the arrows Five rows are shown If the pattern is continued for two more rows, what is the sum of all seven numbers in that row? ĐA: Question 10 Stacy has three children: Amy, Ben and Carl They are 3,5 and 13 years old When 31 is divided by Carl's age, the remainder is Ben is younger than Carl Who is oldest among the children? ĐA: Amy 31 chia Carl dư  Carl = ; Ben < Carl  Ben = Amy = 13 tuổi TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 Question 11 The numbers from through are placed in the grid, exactly one per box without repeats The numbers shown at the end of each row are the products of the numbers in that row The numbers shown at the bottom of each column are the products of the numbers in that column What is the sum of the numbers in the four corners of the by grid? ĐA: 22 Tổng góc = + + + = 22 Question 12 What number between 200 and 300 is exactly divisible by 3, by 5, and by 7? ĐA: 210 Số nhỏ Chia hết cho , : x x = 105 Nằm 200 300  số 105 x = 210 Question 13 In a class of 27 students, 16 like video games and 20 like cartoons If 12 students like both video games and cartoons, how many students not like either? ĐA: Số bạn thích = 16 + 20 – 12 = 36 – 12 = 24 bạn Số bạn khơng thích = 27 – 24 = bạn Question 14 The sum of the digits of the number 789 is 24 How many 3-digit numbers have the sum of their digits equal to 24 including 789? ĐA: 10 số Hỏi số có chữ số có tổng = 24? ̅̅̅̅̅ a+b + c = 24 9bc  b+c = 15  (69; 78; 87; 96 )  số TRUNG TÂM TOÁN SONG NGỮ HOA KỲ - LỚP CÔ THÚY- ZALO 0986692706 8bc  b+ c = 16  ( 97; 88 ; 79 )  số 7bc  b+c = 17  số bc  b + c = 18  số Tổng = + +2 +1 = 10 số Question 15 In the puzzle (cryptarithm) below, each letter stands for the different digit Find the sum A+B+C ĐA: