Place the digits 1 through 9 in the circles in a very special way.

What are the last two digits of large power of 7?

What are the last two digits of a huge number?

Determine a number given its particular properties.

Write a given number as the difference of two squares.

Find a special number that can make other numbers into perfect squares.

Find particular factors that produce 1,000,000.

Using only a digit and the four basic operations (+, -, x, /), produce a set of numbers.

Find all the whole numbers that can replace the variable x in a given expression so that the…

Do any numbers from a given set have a sum of 100?