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  2. 6174 - Wikipedia

    en.wikipedia.org/wiki/6174

    This number is renowned for the following rule: Take any four-digit number, using at least two different digits (leading zeros are allowed). Arrange the digits in descending and then in ascending order to get two four-digit numbers, adding leading zeros if necessary. Subtract the smaller number from the bigger number. Go back to step 2 and repeat.

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    If the top number is too small to subtract the bottom number from it, we add 10 to it; this 10 is "borrowed" from the top digit to the left, which we subtract 1 from. Then we move on to subtracting the next digit and borrowing as needed, until every digit has been subtracted. Example: [citation needed]

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    The product of the 2 one-digit numbers will be the last two digits of one's final product. Next, subtract one of the two variables from 100. Then subtract the difference from the other variable. That difference will be the first two digits of the final product, and the resulting 4 digit number will be the final product. Example:

  5. Kaprekar's routine - Wikipedia

    en.wikipedia.org/wiki/Kaprekar's_routine

    It was found that the number of integer solutions x~u of the equations that can be established is the same as the number of solutions that express all of the n-digit Kaprekar numbers. In addition, there are no Kaprekar numbers for 5-digit and 7-digit numbers because they do not satisfy the above equations.

  6. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9] In elementary arithmetic, students typically learn to add whole numbers and may also learn about topics such as negative numbers and fractions.

  7. 495 (number) - Wikipedia

    en.wikipedia.org/wiki/495_(number)

    The Kaprekar's routine algorithm is defined as follows for three-digit numbers: Take any three-digit number, other than repdigits such as 111. Leading zeros are allowed. Arrange the digits in descending and then in ascending order to get two three-digit numbers, adding leading zeros if necessary. Subtract the smaller number from the bigger number.

  8. What do the numbers on your credit card mean? - AOL

    www.aol.com/finance/numbers-credit-card-mean...

    Credit card numbers are either 15 or 16 digits, with each digit having its own meaning and purpose. Keeping your credit card number safe can help prevent fraudulent purchases and the stress they ...

  9. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    The number at which this adjustment happens is called the modulus. For example, a regular clock has a modulus of 12. In the case of adding 4 to 9, this means that the result is not 13 but 1. The same principle applies also to other operations, such as subtraction, multiplication, and division. [139]

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