enow.com Web Search

  1. Ad

    related to: 3 digit numbers divisible by 9
  2. education.com has been visited by 100K+ users in the past month

    Education.com is great and resourceful - MrsChettyLife

    • Digital Games

      Turn study time into an adventure

      with fun challenges & characters.

    • Activities & Crafts

      Stay creative & active with indoor

      & outdoor activities for kids.

Search results

  1. Results from the WOW.Com Content Network
  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    First, take any number (for this example it will be 492) and add together each digit in the number (4 + 9 + 2 = 15). Then take that sum (15) and determine if it is divisible by 3. The original number is divisible by 3 (or 9) if and only if the sum of its digits is divisible by 3 (or 9).

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    If the digit 9 is ignored when summing the digits, the effect is to "cast out" one more 9 to give the result 12. More generally, when casting out nines by summing digits, any set of digits which add up to 9, or a multiple of 9, can be ignored. In the number 3264, for example, the digits 3 and 6 sum to 9.

  4. Digit sum - Wikipedia

    en.wikipedia.org/wiki/Digit_sum

    Digit sums and digital roots can be used for quick divisibility tests: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. For divisibility by 9, this test is called the rule of nines and is the basis of the casting out nines technique for checking calculations.

  5. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    Plot of the number of divisors of integers from 1 to 1000. Highly composite numbers are in bold and superior highly composite numbers are starred. ... 3, 6, 9, 13, 18 ...

  6. Palindromic number - Wikipedia

    en.wikipedia.org/wiki/Palindromic_number

    All palindromic numbers with an even number of digits are divisible by 11. [1] There are 90 palindromic numbers with three digits (Using the rule of product: 9 choices for the first digit - which determines the third digit as well - multiplied by 10 choices for the second digit):

  7. Harshad number - Wikipedia

    en.wikipedia.org/wiki/Harshad_number

    The number 18 is a harshad number in base 10, because the sum of the digits 1 and 8 is 9, and 18 is divisible by 9.; The Hardy–Ramanujan number (1729) is a harshad number in base 10, since it is divisible by 19, the sum of its digits (1729 = 19 × 91).

  8. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    The final digit of a triangular number is 0, 1, 3, 5, 6, or 8, and thus such numbers never end in 2, 4, 7, or 9. A final 3 must be preceded by a 0 or 5; a final 8 must be preceded by a 2 or 7. In base 10, the digital root of a nonzero triangular number is always 1, 3, 6, or 9. Hence, every triangular number is either divisible by three or has a ...

  9. Polydivisible number - Wikipedia

    en.wikipedia.org/wiki/Polydivisible_number

    Polydivisible numbers represent a generalization of the following well-known [2] problem in recreational mathematics: Arrange the digits 1 to 9 in order so that the first two digits form a multiple of 2, the first three digits form a multiple of 3, the first four digits form a multiple of 4 etc. and finally the entire number is a multiple of 9.

  1. Ad

    related to: 3 digit numbers divisible by 9