Number Facts

• The numerical digits we use today such as 1, 2 and 3 are based on the Hindu-Arabic numeral system developed over 1000 years ago.

• If the sum of a number’s digits is a multiple of 3, that number can be divided by 3.

• The smallest ten prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

• Zero is the only number which is known with so many names including nought, naught, nil, zilch and zip.

• Forty is the only number which when spelled out in English has its letters in alphabetical order.

• The highest number that can be spelled out without using any letter more than once is five thousand. The next highest is eighty-four.

• 12 + 3 – 4 + 5 + 67 + 8 + 9 = 100

• 111111111 x 111111111 = 12345678987654321

• A paper cannot be folded more than 9 times. Try it!

• One of the most widespread superstitious beliefs is that the number 13 is unlucky.

• Zero is the only number which cannot be represented by Roman numerals.

• Million is 1 followed by 6 zeros. Billion 9 zeros and trillion: 12 zeros. Hence the order is: one, hundred, thousand, million, Billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion, undecillion, duodecillion, tredecillion, etc.