Mathematics
Fill in the blanks:
(i) A number having exactly two factors is called a ….
(ii) A number having more than two factors is called a …
(iii) 1 is neither ….. nor ……..
(iv) The smallest prime number is ….
(v) The smallest odd prime number is ….
(vi) The smallest composite number is …..
(vii) The smallest odd composite number is …
(viii) All prime numbers (except 2) are ….
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Answer
(i) A number having exactly two factors (1 and itself) is called a prime number.
(ii) A number having more than two factors is called a composite number.
(iii) 1 is neither prime nor composite.
(iv) The smallest prime number is 2.
(v) The smallest odd prime number is 3.
(vi) The smallest composite number is 4.
(vii) The smallest odd composite number is 9.
(viii) All prime numbers (except 2) are odd numbers.
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Related Questions
State whether the following statements are true (T) or false (F):
(i) The sum of three odd numbers is an even number.
(ii) The sum of two odd numbers and one even number is an even number.
(iii) The product of two even numbers is always an even number.
(iv) The product of three odd numbers is an odd number.
(v) If an even number is divided by 2, the quotient is always an odd number.
(vi) All prime numbers are odd.
(vii) All even numbers are composite.
(viii) Prime numbers do not have any factors.
(ix) Two consecutive numbers cannot be both prime.
(x) Two prime numbers are always co-prime numbers.
Write all the factors of the following natural numbers:
(i) 68
(ii) 27
(iii) 210
Write first six multiples of the following natural numbers:
(i) 3
(ii) 5
(iii) 12
Write:
(i) the seventh multiple of 36
(ii) the even multiples of 9 less than 100
(iii) the odd multiples of 17 less than 150
(iv) the first 3-digit even multiple of 7
(v) the multiples of 6 between 40 and 80
(vi) the greatest 2-digit even multiple of 5