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?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

During which month do people sleep the least?

10+10 and 11+11 can give you the same answer.

Explain how?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Can you count the number of blocks in the picture below?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?