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:

- Which is measured from the circle's centre: the radius or the circumference?
- Which of these numbers are prime numbers: 7, 8, 9, 10, 11, 12, 13, 14?
- What number is 6 more than 7 x 8?
- 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?
- True or False: When you add to odd numbers the sum is always odd?
- Add 9 + 1. Then mulitply 9 x 1. Do you get the same answer each time?
- How many centimetres are in a metre?
- What are the next three numbers in this series: 14, 21, 28, 35,...
- Which is correct: Seven and five is thirteen or Seven and five are thirteen?
- 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?

- Take a look at all these numbers: 66, 22, 99, 33, 44, 55. What number greater than 1 can be divided into all these numbers without leaving a remainder?
- In a drawer you have black socks and white socks. They are not stored away in pairs. Without looking, how many times will you have to reach into the drawer to come out with a matching pair?
- How many metres are in a kilometre?
- What are the next three numbers in this series: 4, 8, 12, 16,...?
- How many sides does a hepatgon have?
- You have $10.60 in two bills and three coins. What bills and coins do you have?
- If 7 is transformed into 13 and 11 is changed to 21 then what does 16 become?
- How many sides does an octagon have?
- What is the Roman numeral for 500?
- 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?

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