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1
Numbers which are not divisble by any other number except 1 and the number itself are called _____________
Co- prime
Prime number
Composite number
Odd prime
2
Example for co-prime mumbers is:
25, 14
18, 16
9, 18
11, 77
3
Number of prime numbers from 1 to 50 are:
18
12
15
20
4
23 and 24 are co-prime numbers or not?
True
False
Not sure
None of these
5
Number which have more than two different factors are called __________________
Co- prime numbers
Twin prime numbers
6
Which of the following is not a composite number?
7
8
1 is neither ______ nor composite.
twin prime
co- prime
odd prime
prime
The difference between a 2- digit number and the number obtained by reversing the digit is 45 .The difference between the two digit of that number is _______________.
9
Find the sum of the values of the literal (b) in the general form represents for the number 904, 326, 984
10
Set the three consecutive prime numbers is called a prime triplets, which of the following is a prime triplet?
2, 4, 5
7, 9, 13
5, 7, 11
2, 3, 8
11
The smallest and largest three digit odd number are __________________
101,997
101, 999
100, 998
101, 998
The sum of the digits of a 2 -digit number is 14. If digits are reversed, the new number decreases by 36 the number is _____________.
56
78
95
96
13
In a two-digit number,the digit in the units place is four times the digit in the tens place and sum of the digits is equal to 10. Find the number.
32
14
37
28
Identify the twin primes pairs:
(19, 21) and (9, 11)
(29, 31) and (17, 19)
Both A and B
none of these
If p is the prime number that (p+2) is also a prime number , then p(p+2)+1 is always ___________________
A prime number
An odd integer
Not a perfect square
A perfect square
16
Number of pairs of twin prime numbers between 1 and 50 are ______________
17
If p and q are co-prime numbers then is p2 and q2 are also co-prime?
yes
no
maybe
__________________ are 5 consecutive composite numbers less than 100 so that there is no prime number between them .
89, 91, 93, 95, 97
90, 92, 94, 96, 98
91, 92, 93, 94, 95
19
Which is the smallest and largest odd prime number in between 24 and 60 ?
27,57
29,57
29,59
27,59
Find the product of the values of the literal (a) in 325, (b) in 526 and (c) in 987 when the general form is .
25
42