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 metric unit of length do the letters 'cm' stand for?
- Which number should replace the question mark? 5, 14, 23, 32, 41, ?, 59
- How many sides does a triangle have?
- What is a greater distance: 10 inches or 10 centimetres?
- Which is correct: Seven and five is thirteen or Seven and five are thirteen?
- 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? - You have a 4 gallon and a 7 gallon jug of water. How can you measure exactly 6 gallons of water using these two jugs?
- How many sides does a hexagon have?
- True or False: When you add to odd numbers the sum is always odd?
- How many sides does a decagon have?

- 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?
- You are 9 years old and your dad is 47. How old will your dad be when you are 21?
- Are Roman numerals given in small letters or capital letters?
- A farmer has seventeen sheep. All but nine of them die. How many sheep does he have left?
- How many tens equal one thousand?
- Change this into a multiplication problem; 5+5+5+5=20
- 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?
- What is the Roman numeral for 500?
- A boy is 2 years old, his brother is half as old as him. When the first boy is 100, how old will his brother be?
- How many sides does a pentagon have?

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