A natural number is divisible by 3 if the sum of its digits in base 10 is also divisible by 3. This known as the divisibility rule of 3. Because of this, the reverse of any number that is divisible …

Learn the different ways number 3 can be represented. See the number three on a number line, five frame, ten frame, numeral, word, ... Learn about the number 3.

For example, the number 21 is divisible by three (3 times 7) and the sum of its digits is 2 + 1 = 3. Because of this, the reverse of any number that is divisible by three (or indeed, any …

Three is an important number for many cultures (groups of people living together). It is also a prime number. It is the first odd prime. In Roman numerals, it is III. three gifts of the wise men …

amicable numbers, in mathematics, a pair of integers in which each is the sum of the divisors of the other. The first pair of amicable (“friendly”) numbers, 220 and 284, was discovered by the …

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For example, in the fraction of 3 8, the numerator is 3, and the denominator is 8. A more illustrative example could involve a pie with 8 slices. 1 of those 8 slices would constitute the …

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3 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one. What does the number 3 look like? As a prime, it is not composed of any other …

Draw a circle with a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi. Pi (pronounced like "pie") is …