Homework, mathematics grade 4

1. 1. The numbers 1 to 7 are arranged in the circles in such a way that the sum of the 3 numbers on each line is 14. What is the value of m?

• A. 7

• B. 8

• C. 9

• D. 4

• E. Both A and D

2. 2. In a new operation,

3. 2 ※ 4 = 8

4. 4 ※ 3= 11

5. 8 ※ 7 = 23

6. Find the value of 13 ※ 9 = ?

• A. 35

• B. 36

• C. 37

• D. 38

• E. 40

3. 3. Find the value of 𝐴𝐵

• A. 32

• B. 38

• C. 44

• D. 54

• E. 65

4. 4. How many rectangles are there in the figure?

5. (Chú ý: hình vuông trong hình vẽ cũng xem như là hình chữ nhật)

• A. 22

• B. 24

• C. 25

• D. 26

• E. 27

5. 5. How many numbers are there in the sequence below?

    

   4, 10, 16, 22. 28, ... , 64

• A. 8

• B. 10

• C. 12

• D. 14

• E. None of the above

8. 8. A prime number is a number that has exactly two positive factors, 1 and itself.

    

   Examples of prime numbers include

   2, 3, 5, 7, 11, I3, ....

    

   The sum of 2 prime numbers is 34. Find their smallest possible product.

• A. 48

• B. 54

• C. 72

• D. 88

• E. 93

9. 9. Marvin wrote the following sequence on the whiteboard.    
   

   1,2,3,4,5,6,7,...

    

   What is the 177’th digit he wrote?

• A. 1

• B. 2

• C. 3

• D. 4

• E. 5

10. 10. Find the number represented by the last figure,

• A. 13

• B. 31

• C. 32

• D. 23

• E. None of the above