Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

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

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

Find the number of squares in the below-given picture.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?