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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Using the example above: 16,499,205,854,376 has four of the digits 1, 4 and 7 and four of the digits 2, 5 and 8; since 4 − 4 = 0 is a multiple of 3, the number 16,499,205,854,376 is divisible by 3. Subtracting 2 times the last digit from the rest gives a multiple of 3. (Works because 21 is divisible by 3)

  3. Harshad number - Wikipedia

    en.wikipedia.org/wiki/Harshad_number

    The number 19 is not a harshad number in base 10, because the sum of the digits 1 and 9 is 10, and 19 is not divisible by 10. In base 10, every natural number expressible in the form 9R n a n , where the number R n consists of n copies of the single digit 1, n > 0, and a n is a positive integer less than 10 n and multiple of n , is a harshad ...

  4. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    For example, "a divided by b" can be written as: which can also be read out loud as "divide a by b" or "a over b". A way to express division all on one line is to write the dividend (or numerator), then a slash, then the divisor (or denominator), as follows: /

  5. Googolplex - Wikipedia

    en.wikipedia.org/wiki/Googolplex

    In comparison, Earth's mass is 5.97 × 10 24 kilograms, [5] the mass of the Milky Way galaxy is estimated at 1.8 × 10 42 kilograms, [6] and the total mass of all the stars in the observable universe is estimated at 2 × 10 52 kg. [7] To put this in perspective, the mass of all such books required to write out a googolplex would be vastly ...

  6. Long division - Wikipedia

    en.wikipedia.org/wiki/Long_division

    Decimal numbers are not divided directly, the dividend and divisor are multiplied by a power of ten so that the division involves two whole numbers. Therefore, if one were dividing 12,7 by 0,4 (commas being used instead of decimal points), the dividend and divisor would first be changed to 127 and 4, and then the division would proceed as above.

  7. 1,000,000,000 - Wikipedia

    en.wikipedia.org/wiki/1,000,000,000

    (10 9 months is roughly 83.3 million years.) About 10 9 years—a gigaannus—ago, the first multicellular eukaryotes appeared on Earth. About 10 9 decades ago, the thin disk of the Milky Way started to form. (10 9 decades is exactly 10 billion years.) The universe is thought to be about 13.8 × 10 9 years old. [7]

  8. How To Write Numbers in Words on a Check - AOL

    www.aol.com/write-numbers-words-check-000044077.html

    Write the amount in numbers in the box with the dollar sign. On the row beneath “Pay to the order of,” write the payment amount in words. Sign your name on the line in the bottom right.

  9. 10,000,000 - Wikipedia

    en.wikipedia.org/wiki/10,000,000

    10,000,000 (ten million) is the natural number following 9,999,999 and preceding 10,000,001. In scientific notation, it is written as 10 7. In South Asia except for Sri Lanka, it is known as the crore. In Cyrillic numerals, it is known as the vran (вран — raven).