Composite Numbers

Q.

Write all the prime numbers between $1$ to $20$.

Q.

Number of prime numbers between $1$ to $50$ are

1. $18$

2. $12$

3. $15$

4. $20$

Q.

The HCF of two prime numbers is always equal to their product.

1. TRUE

2. FALSE

Q.

On dividing 59761 by a certain number , the quotient is 189 and the remainder is 37. Find the divisor.

Q.

Odd one out:

$PRV,LMP,DGL,BEL$

Q. Can you instantly find the greatest and the smallest numbers in this row?
$382$, $4972$, $18$, $59785$, $750$.
Was that easy? Why was it easy?

Q. Explain why $7\times 11\times 13+13$ and $7\times 6\times 5\times 4\times 3\times 2\times 1+5$ are composite numbers

Q. Find the largest number which 615 and 963 leaving remainder 6 in each case.

Q.

How many composite numbers are between $1$ and $50$?

Q. composite numbers are there in the first 10 natural numbers.

1. $6$
2. $5$
3. $4$
4. $3$

Q.

Find the list of all composite numbers between $100$ and $110$ inclusive.

1. $100,102,104,105,106,108,110$
2. $100,103,104,105,106,108,110$
3. $100,102,107,105,106,108,110$
4. $100,102,104,105,106,109,110$

Q. Find the value of p and q, so that the prime factorisation of 2520 can be expressed as $2^3\times 3^p\times q\times 7$.

Q. The numbers having only 1 and itself as its factors are called prime numbers.

1. True
2. False

Q. Beena has one dozen of bangles and Teena has three dozens of bangles. Teena gave half dozen of bangles to Beena. How many bangles does Beena have now?

1. 18
2. 12
3. 1.5 dozen
4. 36

Q.

Write all the composite numbers between the following numbers:

$70$ and $95$

Q.

Write five consecutive composite numbers between $150$ and $250$ such that there are no two prime numbers between them .

Q.

How many prime numbers are there between $1$to $100$

1. $12$

2. $15$

3. $25$

4. $20$

Q. What are Composite Number ?

Q. Can you instantly find the greatest and the smallest numbers in this row?
$1473$, $89423$, $100$, $5000$, $310$.
Was that easy? Why was it easy?

Q.

Is the product of any two even numbers always an even number?

Q.

Express $66$ as a sum of two odd primes.

Q.

The product of three odd numbers is odd.

1. True
2. False

Q. Find the prime numbers from the following.

30, 31, 32, 33, 34, 35, 36, 37, 38, 39.

1. 32 and 39
2. 30 and 34
3. 31 and 37
4. 35 and 37

Q.

Question 140

Fill in the blank to make the statement true.
The numbers having more than two factors are called ___ numbers.

Q.

The digit in the ones place of a number is $5$ and the number is greater than$10$. Will it be a prime number or a composite number?

Q.

One-third of a number added to one-fifth gives 32. Find the number.[3 MARKS]

Q.

The least value of HCF possible for any two numbers is ___ .

Q.

Find the HCF of the following numbers by prime factorization method 183, 793, 976

Q.

The largest 3 digit composite number is 999.

1. 1000

2. 999

Q. 2 is the only even prime number.

1. True
2. False