Page 55 of 68
Page 56 of 68 Answer: ...
Question 10:
The sum of the digits of all 2-digit numbers is ...
Exam number 2: Choose the most suitable answer in 4 available answers. (Cóc vàng tài ba) Question 11:
Which of the following numbers can represent the question mark?
a. 48 b. 45 c. 54 d. 36
Question 12:
Which of the following numbers is divisible by 6?
a. 33332 b. 25760 c. 42378 d. 12357
Question 13:
Which of the following is the number 2,003,047?
a. Two million, three thousand, fourty seven b. Two million, thirty thousand, four seven c. Two million, three thousand, four seven d. Two million, thirty thousand, fourty seven Question 14:
Find the value of
The value of A is ...
Page 57 of 68
a. 1007 b. 4006/2015 c. 2015 d. 4002/2015
Question 15:
Jonn uses 1/3 of his land for growing apples, 1/4 for oranges, 1/5 for bananas and the remaining 13 hectares for flowers. The total area of his land is ... hectares.
a. 60 b. 70 c. 50 d. 80
Question 16:
Find the value of B = 2016 x 20152015 - 2015 x 20162015 Answer: The value of B is ...
a. 2015 b. 2016 c. 20152016 d. 20162015
Question 17:
The product of 2 natural numbers is 2015. Find the smallest possible sum of these two numbers?
Answer: The smallest possible sum of these numbers is ...
a. 96 b. 65 c. 408 d. 2016
Question 18:
Peter, Bob and Jack do a work. If they work in pairs: Peter and Bob can complete it in 12 hours; Bob and Jack can complete it in 10 hours; Jack and Peter can complete it in 15 hours.
Peter needs ... hours to complete this work by himself.
a. 18 b. 40 c. 24 d. 42
Question 19:
One chain with 3 links is 14cm long. Another chain made from 5 links of the same type is 22cm long. How long is a chain with 40 such links?
Answer: A chain with 40 such links is ...
a. 162cm long b. 158cm long c. 160cm long d. 155cm long Question 20:
Find the missing number x in the following number sequence:
2 9 18 25 x 57 114 121 Answer: x is ...
Page 58 of 68
a. 32 b. 34 c. 50 d. 45
Exam number 3: Vượt chướng ngại vật Question 21:
Fill in the blank with the correct number 35km + 700cm = ... m
Question 22:
765 - ... = 123 x 2 + 276
The correct number filled in the blank is ...
Question 23:
How many triangles in the following figure?
Answer: There are ... triangles.
Question 24:
Find the value of digit x if 2006 < 20x5 < 2041 and 20x5 is divisible by 3?
Answer: The value of x is ...
Question 25:
Find the greatest natural number m such that:
Answer: m = ...
Page 59 of 68 Exam number 1: Choose the most suitable answer in 4 available answers.
Question 26:
The area of the following rhombus is ...
a. 6cm2 b. 12cm2 c. 120cm2 d. 60cm2
Question 27:
Which of following numbers is smaller than 55606149 and larger than 55604896?
a. 55695346 b. 55614186
c. 55605268 d. 55601982
Question 28:
Anna bought 40 jellybeans. Which statement is incorrect?
a. She can divide the beans equally into five groups.
b. She can divide the beans equally into groups of 2.
c. She can divide the beans equally into groups of 4.
d. She can divide the beans equally into three groups.
Question 29:
Bob chose a natural number and multiplied it by four. Which of following numbers could not be his answer?
a. 4846 b. 3756 c. 5924 d. 1736
Question 30:
Suppose all counting numbers are arranged in columns as shown at the right. Under what letter will the number 2016 appear?
Page 60 of 68
a. F b. C c. E d. B
Question 31:
Given five numbers, the average of two numbers is 17 and the average of the other three numbers is 12. The average of all these number is...
a. 5/2 b. 29 c. 14 d. 29/2
Question 32:
In the following expression: 20 - 16 + 7 : 36 x 12, if "+" means "x"; "-" means "+"; ":" means
"-" and "x" means ":" the its value is ...
a. 82/3 b. 124 c. 19/3 d. 129
Question 33:
Donald Trump has 19 grandchildren, all of different ages. Anna is the eldest. The sum of ages of all grandchildren is 190. At least how old is Anna?
a. 24 b. 20 c. 25 d. 19
Question 34:
A square floor is tiled with congruent square tiles. The tiles on the two diagonals of the floor are black. The rest of the tiles are white. If there are 201 black tiles then the total number of white tiles is ...
a. 10000 b. 9799 c. 10203 d. 9600
Question 35:
The following chart shows the number of fruits in a shop. There are ... more oranges than peaches.
Question 36:
Fill the missing number in the blank.
Page 61 of 68 44444 = 40000 + 400 + ... + 4
Question 37:
The average of 4, 8, and 13 is 8. The value of is ...
Question 38:
How many zero digits are there in ten million?
Answer: ...
Question 39:
The sum of two fractions and is a fraction with denominator of 12. Find its numerator.
Answer: ...
Question 40:
Three pumpkins are weighed in pairs in all possible ways. The weights of all these pairs are 8kg, 9kg and 11kg. How much does the lightest pumpkin weight?
Answer: ... kg.
Question 41:
It takes Jack 42 minutes to cut a long log of wood into seven pieces. How long will it take him to cut that log of wood into nine pieces?
Answer: ... minutes.
Question 42:
The floor of a rectangular room is covered with square tiles. The room is 24 tiles long and 16 tiles wide. The number of tiles in the outer border of the floor is ...
Question 43:
There are 3 children in a family, Jack, Mary and Peter. Mary can clean the house for 1 hour.
Jack can do the same job for 2 hours and Peter needs 6 hours.
If they do the job together then they need ... minutes.
Question 44:
MNPQ is a square that is made up of two identical rectangles and two squares of area 9cm2 and 16cm2. The area of the square MNPQ is ... cm2.
Question 45:
What fraction of the circle is colored?
Page 62 of 68 Answer: ...
(Write your answer in simplest form) Question 46:
The four - digit number 5BB1 is divide by 9.
The value of B is ...
Question 47:
Which of the following diagrams is different from the others?
a. Figure B b. Figure D c. Figure C d. Figure D
Question 48:
In a restaurant, there are 17 tables, each with 3, 4 or 6 chairs. The tables with 3 or 4 chairs can accommodate 44 people. The restaurant can accommodate 74 people. How many tables are there with 3 chairs?
Answer: ... tables.
Question 49:
Bella thinks of two consecutive numbers in the range 1 to 6. She tells Alice one of the numbers and Jack the other. Alice and Jack have the following conversation:
Jack: I don't know your number.
Alice: I don't know your number, too.
Jack: Now I know!
The pair of numbers which Bella think of could be ...
a. 3 and 4 b. 4 and 5
c. 2 and 3 d. 5 and 6
Page 63 of 68
Page 64 of 68
CÁC DẠNG BÀI CƠ BẢN
1. Chọn các ô trong bảng
1.1. Find pairs of the same value (tìm các ô có giá trị bằng nhau)
5870 2546 3188 x 3 2344
8974 x 7 2482 9824 4500 – 1956
2391 x 4 2544 3460 9654
2456 x 4 1273 x 2 9784 x 6 5000 – 1540
5000 – 2518 3218 x 3 586 x 4 61000 + 1818
1.2. Arrange the values in ascending order (sắp xếp theo thứ tự tăng dần)
1905 12869 x 4 1250 13000 + 913
11000 + 1886 11000+ 890 1945 1286
30000 + 4162 x 4 1282 4000 x 3 14000 + 50
1393 50000 + 325 x 3 1290 50000 + 307 x 7
9000 + 1000 13000 + 988 10000 + 386 1954
1.3. Find pairs of the same value (tìm các ô có giá trị bằng nhau)
2456 3456 3000 – 432 1672 x 2
2498 4000 – 518 2548 2478
864 x 4 873 x 4 3344 3498
637 x 4 1228 x 2 3492 583 x 6
413 x 6 2568 3482 1249 x 2
1.4. Arrange the values in ascending order (sắp xếp theo thứ tự tăng dần)
5758 5886 60000 – 1234 x 4 17000 + 1983
14255 x 4 13066 x 4 3004 27000 + 450 : 5
21000 + 250 x 2 3112 5525 (8704 + 908) x 6
25000 + 300 x 3 15000 + 1000 9000 x 3 3458
4520 19000 + 1000 4832 24000 + 680
Page 65 of 68 2. Hình học
Definition: trapezium (hình thang), area (diện tích), perimeter (chu vi), square (hình vuông), rectangle (hình chữ nhật)
2.1. The perimeter of a rectangular field is 100m. The length increases by 1/3 then the perimeter is 120m. Find the area of the field.
2.2. The perimeter of a rectangular field is 110m. If the width increases by 5m and the length decreases by 5m, the area is unchanged. Find the area of the field.
2.3. The perimeter of a rectangular field is 200m. The length is 10m more than 2 times of the width. Find the area of the field.
2.4. If the width of a rectangle increases to be equal to the length, the area increases by 20m2. If the length decreases to be equal to the width, the area decreases by 16m2. Find the area.
2.5. The area of a rectangle is 135m2. The width equals 3/5 of the length. Find the perimeter.
2.6. The perimeter of a rectangular yard is 110m. If the width increases by 5m, the yard becomes a square. Find the area of the rectangular yard.
2.7. The perimeter of a rectangle is 150m. If the length decreases by 10m and the width increases by 5m, the new length is 4 times of the new width. Find the area of the rectangle.
2.8. The length of a rectangle is 4 times of the width. If the length increases by 5m and the width decreases by 5m, the area decreases by 256m2. Find the area of the rectangle.
3. Bài toán ẩn số
3.1. Find x such that x + 2386 = 11464 3.2. A = 1000 – 248 : y. Find A if y = 8 3.3. B = 51824 – n x 9. If B = 40367, find n.
3.4. If y = 1285, “324 + y : 5” equals ……….
3.5. Q = p x 5641 + 4359 x p. Find Q if p = 11 3.6. Calculate 2683 x n - n x 683 if n = 5 3.7. Find y such that y x 4 + 35719 = 45779 3.8. Find k such that k : 3 x 4 + 2746 = 5362 3.9. M is the sum of all 1-digit number. Find M.
Page 66 of 68 4. Hoàn thành phép toán
Fill in the blank with suitable number to have a correct operation.
4.1.
8125
* * * * 2889
4.2.
* * 29 3716 91* *
4.3.
261*
4 * *5
*553
4.4.
83**
*574 1* 28
4.5.
9 * 3*
27 * 6
*392
4.6.
*3* 2 5* 4 * 3246
4.7.
8012
* * * * 1267
4.8.
49 * 8
* * 68
4.9.
538
* 4 **2
5. Trung bình
Definition: average (trung bình)
5.1. Find the average of all whole numbers from 1 to 17
Page 67 of 68 5.2. Mai made cakes in 2 days. On the first day, she made 50 cakes. On the second day, she made 20 cakes more than the first day. How many cakes did she make on each day on average?
5.3. A group of truck carried goods in 2 trips. In the first trip, there were 5 trucks and each carried 315kg of goods. In the second trip, there were 4 trucks and each carried 225kg of goods. How many kilograms of goods did each truck carry on average?
5.4. 3 groups of men planted trees. Group 1 had 3 men and each planted 72 trees. Group 2 had 4 men and each planted 65 trees. Group 3 had 3 men and each planted 68 trees.
How many trees did each man plant on average?
5.5. Tri, Manh, Tai collected waste paper. Tri collected 24kg, Manh collected 20kg and Tai collected 4kg more than Tri. How many kilograms of waste paper did each boy collect on average?
5.6. After 3 Math tests, Binh’s average score was 5. What score does he need to score in the next test so that his average Math score is 6?
5.7. A car travelled in 6 hours. During the first 3 hours, it travelled 42km in each hour. In the next 2 hours, it travelled 38km in each hour. How long did it travel in the last hour? Given that it travelled 41km per hour on average.
5.8. Find the average of all 2-digit odd numbers greater than 79.
5.9. Find the average of all 3-digit even numbers.
6. Các bài toán về số
Definition: digit (chữ số), fraction (phân số), numerator (tử số), denominator (mẫu số), whole number (số tự nhiên), odd (lẻ), even (chẵn), divisible (chia hết), remainder (số dư), ones (đơn vị), tens (chục), hundreds (trăm), thousands (nghìn)
6.1. A number has 80 thousands, 6 hundreds and 2 ones. What is the number?
6.2. When writing digit 5 to the left of a 3-digit number, how many ones is the new number more than the old one?
6.3. The sum of all digits of a 3-digit number is 26. When swapping 2 digits in hundreds and ones places, the number does not change. Find the number.
6.4. How many odd numbers are there in a series of whole numbers from 325 to 796?
6.5. A = 1 x 2 x 3 x 4 x 5 x 6 + 63 : 9. Without calculating, find the last digit of A.
6.6. How many even numbers are there in a series of whole numbers from 324 to 987?
6.7. Write number 862305 in words.