Learn all about Composite Numbers in the Number System for ADRE Grade 3, Assam. Clear concepts with examples, definitions, and practice questions. Perfect for Assam ADRE Grade 3 exam prep!

Follow Us

Composite Number (যৌগিক সংখ্যা)

Numbers that can be divisible by 1 or another number are called composite numbers. Compound numbers have more than 2 factors (যিবোৰ সংখ্যাক ১ বা আন এটা সংখ্যাৰে হৰণ কৰিব পাৰি সেইবোৰক যৌগিক সংখ্যা বোলা হয়। যৌগিক সংখ্যাৰ ২টাতকৈ অধিক গুণক থাকে)

Examples: 4, 6, 8, 9, 10, 12, 14, 15 ............. and so on.

4 is the smallest composite number (৪ হৈছে আটাইতকৈ সৰু যৌগিক সংখ্যা)

1 is neither prime nor composite number (১ মৌলিক সংখ্যা বা যৌগিক সংখ্যাও নহয়)

YouTube Channel

Composite Numbers : Important Questions

• Definition : A composite number is a natural number greater than 1 that has more than two distinct factors (i.e., it is not a prime number). For example, 4 is a composite number because it has factors 1, 2, and 4.

1. What is a composite number (যৌগিক সংখ্যা কি)  

A) A number with only two factors  
B) A number greater than 1 with more than two factors  
C) A number less than 1  
D) A number that is always odd  
Answer : B) A number greater than 1 with more than two factors  

2. Which of the following is a composite number(নিম্নলিখিত কোনটো এটা যৌগিক সংখ্যা)  

A) 2  
B) 3  
C) 4  
D) 7  
Answer : C) 4  

3. How many factors does the composite number 12 have(যৌগিক সংখ্যা ১২ৰ কেইটা গুণনীয়ক আছে)  

A) 2  
B) 4  
C) 6  
D) 8  
Answer : C) 6  

4. Which of these numbers is NOT a composite number(এই সংখ্যাবোৰৰ কোনটো যৌগিক সংখ্যা নহয়?)  

A) 9  
B) 15  
C) 11  
D) 21  
Answer : C) 11  

5. What is the smallest composite number(আটাইতকৈ সৰু যৌগিক সংখ্যা কি)  

A) 1  
B) 2  
C) 4  
D) 6  
Answer : C) 4  

6. Which of the following pairs consists of composite numbers(নিম্নলিখিত কোন জোৰাটোত যৌগিক সংখ্যা আছে)  

A) (3, 5)  
B) (4, 6)  
C) (7, 11)  
D) (2, 13)  
Answer : B) (4, 6)  

7. Is 1 a composite number(১ এটা যৌগিক সংখ্যা নেকি)  

A) Yes  
B) No  
C) Sometimes  
D) Only when divided by 2  
Answer : B) No  

8. Which composite number is also an even number(কোনটো যৌগিক সংখ্যা একে সময়তে জোড় সংখ্যা?)  

A) 9  
B) 15  
C) 8  
D) 25  
Answer : C) 8

9. How can you identify a composite number(যৌগিক সংখ্যা কেনেকৈ চিনাক্ত কৰিব পাৰি?)  

A) It has only two factors  
B) It is divisible by 1 and itself only  
C) It has more than two factors  
D) It is always a prime number  
Answer : C) It has more than two factors  

10. Which of the following is a composite number between 20 and 30 (২০ আৰু ৩০ৰ মাজৰ কোনটো এটা যৌগিক সংখ্যা)  

A) 23  
B) 24  
C) 29  
D) 31  
Answer : B) 24  

Explanations for Key Concepts

• Composite Number : A natural number greater than 1 with more than two factors (e.g., 4, 6, 8, 9). Unlike prime numbers (which have only two factors: 1 and themselves), composite numbers can be divided by other numbers besides 1 and themselves.
• Smallest Composite Number : The smallest composite number is 4 (factors: 1, 2, 4).
• Not Composite : 1 is neither prime nor composite (it has only one factor), and prime numbers like 2, 3, 5, etc., are not composite.
• Factors : To check if a number is composite, find its factors. If it has more than two, it’s composite (e.g., 12 has factors 1, 2, 3, 4, 6, 12).

Author of the Post

---

CEO : Jahidul Islam (Moina)
B.sc, D.El.ED & B.Ed
Assamtetacademy@gmail.com

Study Materials (AssamTET.com)