Which part of London exists in France as well ?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

Name a key which is hardest to turn.

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Can you find the six hidden animals in the picture below?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Count the squares in the matchstick puzzle below?