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:

- How many tens equal one thousand?
- This riddle must be done IN YOUR HEAD and NOT using paper and pen or a calculator. Try it!

Take 1000 and add 40 to it. Now add another 1000 to it.

Now add 30. And another 1000.

Now add 20. Now add another 1000. Now add 10.

What is the total? - True or False: When you add to odd numbers the sum is always odd?
- How many squares are there on a chessboard? (Hint: The answer is not 64.)
- How do you write the number 5 in Roman numerals?
- Which is correct: Seven and five is thirteen or Seven and five are thirteen?
- Are Roman numerals given in small letters or capital letters?
- How many inches are in a foot?
- Which number should replace the question mark? 5, 14, 23, 32, 41, ?, 59
- What is a greater distance: 10 inches or 10 centimetres?

- Give the place value of 5 in the number 254,879.
- How many feet are in a yard?
- How do you write 23 using only the number 2?

34 using only the number 3?

56 using only the number 5?

100 using only the number 9? - If you add 7 to this number, you get 56. What's the number?
- 10 candles stand burning in a dining room. A strong breeze blows in through an open window and extinguishes 3 of them. Assuming the wind doesn't extinguish any more candles, how many candles do you have left in the end?
- If 7 is transformed into 13 and 11 is changed to 21 then what does 16 become?
- You have $10.60 in two bills and three coins. What bills and coins do you have?
- What are the next three numbers in this series: 14, 21, 28, 35,...
- Which is measured from the circle's centre: the radius or the circumference?
- 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?

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