Number Riddles
I am a number. I am even, and when you add 2 to me, I become 10.
What is 8?
I am a number between 500 and 700. The sum of my digits is 12, and I do not have any zeros.
543, 552, 561, 633, etc.
I am a fraction. I am equal to 1/2, but my numerator is 2 digits.
Many answers:
What is 10/20? (or 50/100, etc.)
I am a number. I have 3 digits. The sum of my digits is 9, and all my digits are the same.
What is 333?
I am a number between 2,000 and 3,000. My thousands digit is 2. The sum of my digits is 10. I have at least one repeated digit.
2,242; 2,521; 2,611
I am a fraction greater than 1/2 but less than 1. My denominator is 6.
What is 4/6 or 5/6?
I am a number. I am a multiple of 4 and a multiple of 6, and I am less than 30.
What is 12 or 24?
I am a four-digit number. The digit in my thousands place is twice my hundreds digit. The digit in my tens place is 2 more than my hundreds digit. The digit in my ones place is less than my tens digit.
Various answers:
4,2,4,3 → 4243
I am a fraction between 0 and 1. The denominator is double the numerator. The sum of my numerator and denominator is 18.
What is 6/12?
I am a number. I am greater than 20 and less than 40. I have exactly 3 factors.
What is 25? (1, 5, 25)
I am a number between 3,000 and 6,000. My digits add to 15. I have exactly one digit that is 5, and it is not in the thousands place.
3,5,4,3 → 3543; 4,5,3,3 → 4533
I am a fraction between 1/2 and 1. My numerator is exactly 3 less than my denominator.
5/8, 7/10, etc
I am a number. When you double me and subtract 6, you get 10.
What is 8?
I am a number between 1,000 and 5,000. When my digits are rearranged, I can form at least two other different numbers with the same digits. The sum of my digits is 20, and no digits are zero.
Many possibilities (e.g., 4,6,5,5 → 4655, 4565, 5546, etc.)
I am a fraction between 0 and 1. I am greater than 1/3 but less than 2/3. My numerator and denominator are both less than 10.
2/5, 3/5, 4/7, 5/8, etc.