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Summary

  • Numbers can be written in general form.

Two digit number can be written as 

   
Three digit number can be written as 

  • This general form of numbers are useful in solving puzzles and number games.
  • Divisibility by 10: If the one's place of a number is 0 then it is divisible by 10 .
  • Divisibility by 5: If the ones digit of a number is 0 or 5 then it is divisible by 5.
  • Divisibility by 2: If the one's digit of a number is 0, 2, 4, 6 or 8 then it is divisible by 2.
  • Divisibility by 9 and 3: If the sum of the digits of a number is divisible by 9 (or 3),then it is divisible by 9 (or 3).




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