CBSE Questions for Class 6 Maths Playing With Numbers Quiz 1 - MCQExams.com

Identify the prime number among the following options.
  • $$11$$
  • $$15$$
  • $$18$$
  • $$20$$
Addition of prime number
  • gives a prime number
  • gives a composite number
  • may give a prime number or composite number
  • none of these
Which of the following is the factor of all prime numbers?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
State true or false:
A number and its successor are always co-primes.
  • True
  • False
The total number of prime numbers between $$120$$ and $$140$$ is
  • $$7$$
  • $$6$$
  • $$5$$
  • $$4$$
Which of the following is not a prime number ?
  • 5
  • 7
  • 8
  • 11
Which of the following is not a composite number?
  • $$4$$
  • $$6$$
  • $$7$$
  • $$8$$
An integer which is not divisible by 2 is called a/an
  • even number
  • odd number
  • prime number
  • composite number
The units digit of every prime number (other than $$2$$ and $$5$$) must be necessarily
  • $$1, 3$$ or $$5$$
  • $$1, 3, 7$$ or $$9$$
  • $$7$$ or $$9$$
  • $$1$$ or $$7$$
Which of the following is not a composite number?
  • $$352+6$$
  • $$357+7$$
  • $$352+7$$
  • $$353+1$$
Every composite number can be expressed (factorised) as a product of primes, and this factorisation is unique apart from the order in which the prime factors occur.
  • True
  • False
  • Neither
  • Either
The number of composite numbers between $$101$$ and $$120$$
(excluding both) are
  • $$11$$
  • $$12$$
  • $$13$$
  • $$14$$
The value of $$\textit x $$ in the factor tree is : (Blank Boxes has Multiplication symbol.)

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  • $$30$$
  • $$150$$
  • $$100$$
  • $$50$$
A number other than one which is either divisible by $$1$$ or itself is called a
  • composite number
  • prime number
  • comprime number
  • none of these
Which of the following numbers have most number of divisors?
  • $$176$$
  • $$182$$
  • $$99$$
  • $$101$$
Write three pairs of co-primes between $$15$$ and $$30.$$
  • $$19$$ and $$23, 23$$ and $$25,$$ & $$27$$ and $$29$$
  • $$16$$ and $$21, 18$$ and $$25,$$ & $$20$$ and $$27$$
  • $$16$$ and $$22, 18$$ and $$26,$$ & $$20$$ and $$27$$
  • none of these
Say true or false:
$$45$$ has $$11$$ as a factor.
  • True
  • False
Which of the following is a prime number?
  • $$889$$
  • $$997$$
  • $$899$$
  • $$1147$$
The number of prime numbers between 0 and 20 is
  • 7
  • 8
  • 6
  • 9
Write all prime numbers between $$20$$ and $$50.$$
  • $$21, 29, 33, 37, 41, 43$$ and $$47$$
  • $$29, 33, 37, 39, 41, 43$$ and $$47$$
  • $$23, 29, 31, 37, 41, 43$$ and $$47$$
  • None of these
Say true or false:
$$24$$ is factor of $$48$$
  • True
  • False
The number which is neither prime nor composite is
  • $$3$$
  • $$1$$
  • $$2$$
  • $$5$$
What is the remainder obtained when a prime number greater than $$6$$ is divided by $$6$$? 
  • $$1 \ or\  3$$
  • $$1 \ or\  5$$
  • $$3\  or\  5$$
  • $$4 \ or\  5$$
Common factors of $$9$$ and $$36$$ are
  • $$1,3,9$$
  • $$1,4,3,5,9$$
  • $$1,4,5$$
  • none of these
The numbers which have more than two factors are called
  • even
  • prime
  • composite
  • none of these
The two numbers which have only $$1$$ as their common factor are called as ____ .
  • co-primes
  • twin prime
  • composite
  • none of these
A number is divisible by $$6$$, when it is divisible by both _____ .
  • $$4$$ and $$3$$.
  • $$2$$ and $$4$$.
  • $$2$$ and $$3$$.
  • $$3$$ and $$5$$.
A number is divisible by $$8$$, if the number formed by the digits in ______ places is divisible by $$8$$.
  • units and tens
  • tens and hundreds
  • units
  • units, tens and hundreds
H.C.F. of $$36$$ and $$144$$ is equal to :
  • $$36$$
  • $$144$$
  • $$4$$
  • $$2$$
How many prime numbers are there between $$0$$ and $$30$$?
  • $$9$$
  • $$10$$
  • $$8$$
  • $$11$$
0:0:1


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