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What is the place value of the underlined digit?
A. 400
B. 40000
C. 400000
D. 4000000
The sum of three different primes is 16. What is their product?
A. 55
B. 66
C. 77
D. 140
What number should replace the symbol “#”?
3 + 20 + 500 + # + 90000 = 96523
A. 600
B. 5500
C. 6000
D. 5900
Gita wants to form a 4 digit number where the first and last digits are both primes. What is the difference between the largest and smallest numbers that Gita can form?
Repeated digits are allowed.
A. 5,995
B. 6,996
C. 5,005
D. 6,006
Which of the following number is a prime number between 100 and 150?
A. 111
B. 133
C. 137
D. 157
What is the sum of all prime numbers that goes exactly into both 12 and 18?
A. 5
B. 7
C. 8
D. 9
Which digit cannot be at the ones place if two different numbers are added from the following numbers?
20, 31, 312, 415
A. 2
B. 3
C. 4
D. 5
Three prime numbers multiply together to get 110. What is their sum?
A. 18
B. 20
C. 22
D. 24
How many positive numbers are less than 200, having the sum of digits equal to 7?
A. 13
B. 15
C. 17
D. 19
What is the square of the difference of two prime numbers between 20 and 30?
A. 25
B. 36
C. 49
D. 64
How many numbers are there less than 50, having the sum of digits equal to a prime number?
A. 21
B. 22
C. 23
D. 24
What is the square of the sum of digits of a multiple of 17 between 50 and 60?
A. 25
B. 36
C. 49
D. 64
What is the sum of all prime numbers between 20 and 30?
A. 52
B. 73
C. 54
D. 94
What is the smallest number that has four different prime factors?
A. 180
B. 200
C. 210
D. 230
What is the sum of two prime numbers which multiply to make 497?
A. 64
B. 68
C. 74
D. 78
What is the sum of prime factors of 102?
A. 22
B. 53
C. 23
D. 55
If the sum of two prime numbers is also a prime number, then one of them must be
A. 2
B. 3
C. 5
D. 11
What is the mean value of all prime numbers between 45 and 60?
A. 47
B. 49
C. 53
D. 55
How many factors of 90 are prime numbers?
A. 2
B. 3
C. 4
D. 5
What is the least possible square number that is the sum of two different prime numbers?
A. 4
B. 9
C. 16
D. 25
There are 4 prime numbers between 10 and 20. Janice adds together two of these prime numbers to get a square number. What square number does she get?
A. 16
B. 25
C. 36
D. 49
1001 is the product of three prime numbers. What is the sum of those three prime numbers?
A. 25
B. 27
C. 29
D. 31
Eve is thinking of a two-digit number and gives the following clues: My number is:
* two less than a multiple of 3
* a prime number
* two more than a multiple of 5
* less than 50
What is Eve’s number?
A. 17
B. 23
C. 37
D. 43
What is the square root of the sum of the digits of the prime number between 90 and 100?
A. 3
B. 4
C. 5
D. 2
Here is the start of a number pattern:
1 4 7 10 13 16 ..
What is the sum of the next two numbers?
A. 41
B. 43
C. 45
D. 47
The difference between the two numbers is 5 and their product is 84. What is the larger number?
A. 12
B. 14
C. 16
D. 21
Which whole number less than twenty is both an even number and a prime number?
A. 2
B. 4
C. 10
D. 18
I think of a number, double it and add 7. If the answer is 49, what was the number?
A. 15
B. 17
C. 19
D. 21
4 is a square number and also an even number. How many other whole numbers less than fifty are even square numbers?
A. 2
B. 4
C. 6
D. 3
Three prime numbers multiply together to make 154. What is the sum of three prime numbers?
A. 15
B. 18
C. 19
D. 20