Questions
The numbers that have only two factors, 1 and the number itself, are called ______.
- prime numbers
- numbers
- whole numbers
- irrational numbers
Which of the following are prime numbers?
- 11 and 15
- 13 and 17
- 17 and 27
- None of these
How many prime numbers are there between 10 and 30?
- 5
- 6
- 7
- 8
Which smallest number should be subtracted from 40 to make it prime number?
- 1
- 2
- 3
- 5
How many prime numbers are there between 1 and 20?
- 6
- 7
- 8
- 9
Which of the following conditions is true for prime numbers?
- More than one factor
- Infinite number of factors
- Exactly two factors
- None of these
If 2 is a factor of x, can x be a prime number?
- Yes
- No
- Cannot be determined
- Insufficient data
What is the difference between the smallest and the largest three digit prime numbers?
- 920
- 910
- 896
- 890
What is the difference between the first two odd prime numbers?
- 0
- 1
- 2
- 3
Which of the following is even prime number?
- 2
- 4
- 6
- 8
How many prime numbers are there between 1 and 50?
- 17
- 15
- 13
- 11
How many even prime numbers are there between 1 and 20?
- 1
- 2
- 3
- 10
Which of the following is not a prime number?
- 3371
- 3389
- 3511
- 3573
Which of the following number is a prime number?
- 75
- 77
- 83
- 87
Sally owns a bookshop and keeps record of the number of books sold in a day. At the end of the month, she observes that the total number of books sold by her is a prime number. Which of the following can be the number of books sold?
- 187
- 189
- 191
- 201
How many prime numbers are there between 90 and 100?
- 1
- 2
- 3
- 4
Find the common prime factor of 21 and 35.
- 3
- 5
- 7
- 9
What is the difference between the first two 3-digit consecutive prime numbers?
- 0
- 1
- 2
- 3
If 'a' is the sum of the first 5 prime numbers and 'b' is the smallest odd prime number, what will be the value of a + b?
- 30
- 31
- 32
- 33