6
Learn More
mathematics
This particular brain teaser hinges on a fascinating mathematical property. When you take any three-digit number where the first and last digits are different, reverse it, and subtract the smaller number from the larger, the result is always a multiple of 99. This happens because the middle digit always cancels itself out during the subtraction, leaving you with a calculation equivalent to 99 times the difference between the first and last digits.
Knowing this rule
More Mathematics Trivia Questions
72
What is the sum of angles in a triangle?
24What is the square root of 144?
21a. What was the last year which read the same right side up as upside down? b. What will be the next year?
20If you add the numerical value of all seven Roman numerals, what is the sum?
20If there is a 40% chance that you will get a red light at a certain traffic intersection, what is the probability of you passing through the intersection with green lights three times in a row?
20Describe in words the exact direction that is 697.5° clockwise from due north?