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Multiplying A Repeating 4s Number By 44

Multiplying A Repeating 4s Number By 44

Multiplying a repeating 4's number by 44

  • Choose a repeating 4's number (444, etc.)
  • Multiply it by 44
  • The product is:
    - first two digits are 19
    - next digits are repeating 5's - two fewer than the repeating 4's in the original number
    - last two digits are 36.

   Example:
  1. If the first number is 444444:
  2. Multiply by 44. The product is:
    first two digits are 19: 19.
    next repeating digits are repeating 5's, two fewer than the repeating 4's in the original number: 5555.
    last two digits are 36: 36.
  3. So 444444 × 44 = 19555536.

   See the pattern?

  1. If the first number is 444444444:
  2. Multiply by 44. The product is:
    first two digits are 19: 19.
    next repeating digits are 5's, two fewer than the repeating 4's in the original number: 5555555.
    last two digits are 36: 36.
  3. So 444444444 × 44 = 19555555536.
Big products like these will overwhelm your friend's normal calculator. Easy win for mental math answers here.




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26 Sep, 2021, 02:04:10 AM