Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What jumps when it walks and sits when it stands?

During which month do people sleep the least?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Solve this riddle by finding the odd one out from the rest.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3