In the realm of mathematics, it’s hard to imagine anything more basic than the counting numbers: 1, 2, 3, and so on. Yet this set of mathematical objects abounds with beautiful and unexpected patterns ...

Randomly scramble the digits 0, 1, 2, 3, 4, 5 and 6 to form a seven-digit number (or a six-digit number if the leading digit is 0). Rank the following events in order ...

The crisp new dollar bill that I have just taken from my wallet bears the serial number 24598176. It’s easy to tell that the number is exactly divisible by 2 but not by 5. Is it divisible by 3? by 4?

We represent a number by a sequence of digits. For example, 532 represents a number made up of five 100s, three 10s and two units. Three 10s (30) is divisible by two, because 10 is. Similarly, 500 is ...

DO you have a preference for odd or even numbers? Marissa Mayer, the CEO of Yahoo, does: “I really like even numbers, and I like heavily divisible numbers,” she says in the latest Vogue. “Twelve is my ...

An introduction to odd and even numbers. Even numbers are divisible by two whereas odd numbers are not. At ‘Number School’, numbers are separated into two lines - odd and even. The teacher checks ...

Do you have a preference for odd or even numbers? Marissa Mayer, the CEO of Yahoo, does: "I really like even numbers, and I like heavily divisible numbers," she says in the latest Vogue. "Twelve is my ...