Finding Numbers when Given Relevant Values
Logical Reasoning, and more...
 
1. EASY

I am a prime number. I am a factor of both 12 and 10. What number am I?

 
2. MEDIUM

I am a 2-digit number. The sum of my digits equal 16. My first digit is greater than my second digit. What number am I?

 
3. MEDIUM

I am less than the first 2-digit prime number, but greater than the first odd composite number. What number am I?

 
4. HARD

I am a 3 digit number. If you write me backwards, I am still a 3 digit number. If you add me and my backwards number, you will get 666. What is my middle digit?

 
5. HARD

I am the product of 4 consecutive prime numbers, and my last digit is 0. What is the sum of these 4 prime numbers?