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I am a prime number. I am between 20 and 70. My digits total is 10. Who am I?
37
I am a prime number. I am a 2-digit number. My digits have a difference of 7. Who am I?
29
I am the third prime number after 20. Who am I?
31
I am the fourth prime number after 40. Who am I?
53
I am a prime number. I am between 25 and 42. My units digit is a prime number. Who am I?
37
I am a prime number. I am between 40 and 80. When my digits are reversed I am another prime number. Who am I?
71, 73 or 79
All prime numbers are odd numbers. True or fasle?
False
There are 10 prime numbers less than 30. True or false?
True
All prime numbers have exactly two factors. True or false?
True
1 is not a prime number. True or false?
True
All 2-digit prime numbers have a ones digit of 1, 3, 7 or 9. True or false?
True
There are 4 prime numbers between 10 and 20. True or false?
True
What is the smallest 2-digit prime number?
11
What is the highest common factor of 8 and 12?
4
List three common multiples of 3 and 4.
12, 24, 36, ...
List 3 common multiples of 25 and 20?
100, 200, 300, ...
