**Contents**

## Which number can make everyone stand up?

Answer: The answer to this math riddle is 21. You probably just guessed to answer this math riddle, which is fine, but you can also work it out algebraically. The two-digit number ab stands for 10a + b since the first digit represents 10s and the second represents units.

## What are some good math riddles?

**Math Riddles for Kids**

- Which month has 28 days? …
- What number goes up and doesn’t come back down? …
- If there are 4 apples and you take away 3, how many do you have? …
- If eggs are $0.12 a dozen, how many eggs can you get for a dollar? …
- How did the soccer fan know before the game that the score would be 0-0?

## What has a ring but no finger answer?

1. What Has A Ring But No Finger? The Answer is A Mobile Phone and A Bell, A Mobile phone will often ring when someone calls. Here the ring denotes the sound.

## What has two banks but no money?

The correct answer to What has 2 banks but no money? Riddle is “River.”

## Who invented zero?

About 773 AD the mathematician Mohammed ibn-Musa al-Khowarizmi was the first to work on equations that were equal to zero (now known as algebra), though he called it ‘sifr’. By the ninth century the zero was part of the Arabic numeral system in a similar shape to the present day oval we now use.

## What loses its head in the morning?

The exact answer is A Pillow.

## How can number 4 Be half of 5?

Answer. ➡️ In the “modern” recreation of Roman numerals, the letters IV stand for the number four. The I represents one, the V represents five, and, so it was thought, putting the I before V meant one less than five, or four. Since IV is half the letters of the word FIVE, they represent “half” of FIVE.

## Is the answer 40 or 96?

The two answers to the puzzle are 40 and 96. The quick answer, therefore, is 40, arrived at by simply adding each equation with the sum from the previous equation.

## When can you add 2 11?

So the answer to When can you add two to eleven and get one as the correct answer? Riddle is WHEN YOU ADD TWO HOURS TO ELEVEN O’CLOCK, YOU GET ONE O’CLOCK.

## Which bow can’t be tied?

The right answer to the riddle is the Rainbow. Rainbow is a bow that can’t be tied. Rainbow is an arch of colours visible in the sky.

## What has a lock but no door?

Keyboard has a lock but no door.

## What has neck no head?

The answer to the “who is that with a neck and no head” riddle is “a shirt”.

## What can fly without wings?

The answer to the “what flies without wings” riddle is “time”.

## What has 1000 eyes but Cannot see?

Riddle answer: What has an eye but cannot see? The answer to the “what has an eye but cannot see” riddle is a needle.

## Which is the saddest fruit?

Answers (2) Blueberries are the saddest fruits.

## Who Discovered 1?

In category theory, 1 is sometimes used to denote the terminal object of a category. In number theory, 1 is the value of Legendre’s constant, which was introduced in 1808 by Adrien-Marie Legendre in expressing the asymptotic behavior of the prime-counting function.

## Who invented school?

Horace Mann invented school and what is today the United States’ modern school system. Horace was born in 1796 in Massachusetts and became the Secretary of Education in Massachusettes where he championed an organized and set curriculum of core knowledge for each student.