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.
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