Riddle: What two whole, postive numbers have the same answer when multiplied together as when added together?
Answer: 2 and 2.
Riddle: What two-digit number equals two times the result of multiplying its digits?
Answer: 36 = 2 x 3 x 6.
Riddle: What three whole, positive numbers have the same answer when multiplied together as when added together?
Answer: 1, 2 and 3.  1 x 2 x 3 = 1 + 2 + 3 = 6.
Riddle: What two-digit numbers are each equal to their right-most digit squared?
Answer: 25 = 5² and 36 = 6².
Riddle: What is the highest number that can be written with three digits?
Answer: (9⁹)⁹ = 9³⁸⁷⁴²⁰⁴⁸⁹, which is a number with more than 369 million digits.
Riddle: What do you call a tree that has been TP'ed?
Answer: A toiletry. (Toilet-Tree)
Riddle: What do all the bicycles call the tricycles?
Answer: Try hards.
Riddle: What do you see every day but only outside?
Answer: The riddle "Every day" is unanswered. Do you know the answer? If so, click ANSWER and add your answer in the comments section.
Riddle: What instrument does a skeleton play?
Answer: Trombone.
Riddle: What two numbers always comes first and last respectively in counting numbers?
Answer: 1 and 9. 1 & 9 comes first and last respectively in units, tens, hundreds, thousands,.......