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As illustrated below, Alice needs to draw just 3 (red) squares to create 4 unit squares.

What is the least number of squares she needs to draw to create 16 ...

Each of the digits from 0 to 9 appears in the number \(2^{29}\) once except for one. Which digit is missing?

\(\) Hint: Divisibility Rules

A group of students have decided to buy a birthday cake for their math teacher.

If each of them pays $2, there will be a surplus of $4 for the ...

There are 6 permutations of the digits 1, 2, and 3: \(123, 132, 213, 231, 312, 321.\) The sum of all these 6 numbers is divisible by 111.

Do all ...

Jack begins to walk up a hill at 8 a.m. and reaches the top at noon. The next day, Jack backtracks along the same path, begins to walk down ...

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