These brain teasers have been submitted by our visitors from all around the world. These quiz questions are fun for the brain and will puzzle you for some time.

We have lots more puzzles to provide fun for your brain. Have fun solving these quiz questions. Choose from the following brain games:

- What is the Roman numeral for 500?
- How many sides does a hepatgon have?
- How many sides does an octagon have?
- What are the next three numbers in this series: 14, 21, 28, 35,...
- A man weighing 14 stone and his two sons weighing 7 stone each were stranded on an island. All they had to get off the island was a small boat, but it could only hold 14 stone. How did the man and his sons get off the island?
- How many sides does a decagon have?
- Which is correct: Seven and five is thirteen or Seven and five are thirteen?
- What number is 6 more than 7 x 8?
- A boy and his big sister are sitting around the kitchen table chatting.

The boy says, "If I take two years away from my age and gave them to you, you'd be twice my age."

The sister added, "Why don't you just give me one more and then I'll be three times you age."

How old are the siblings? - If 7 is transformed into 13 and 11 is changed to 21 then what does 16 become?

- What metric unit of length do the letters 'cm' stand for?
- What is a prime number?
- How many sides does a triangle have?
- If a movie starts in an hour and a half, how many minutes do you have to wait to see it?
- Which is measured from the circle's centre: the radius or the circumference?
- Give the place value of 5 in the number 254,879.
- Are Roman numerals given in small letters or capital letters?
- If you add 7 to this number, you get 56. What's the number?
- What are the next two numbers in this series: 2, 9, 16, 23, ...
- What are the next three numbers in this series: 4, 8, 12, 16,...?

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