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Divisibility by two

Kapitoly: Divisibility by two, Divisibility by three, Divisibility by four, Divisibility of five, Divisibility of six, Divisibility of seven, Divisibility of eight, Divisibility of nine, Divisibility of ten, Divisibility of eleven, Divisibility of twelve

How do we find out if a whole number is divisible by two without remainder? If the last digit is even, that is, if the last digit is equal to one of 0, 2, 4, 6, or 8. We can show this with examples:

  • The number 18 is divisible by two because the number ends with the even digit 8, and if we calculate this, we find that 18/2 is 9.
  • The number 27 is not divisible by two because it ends in 7 and if we calculate this we get that 27/2 is equal to 13.5, which is not a whole number.
  • The negative number -30 is also divisible by two, the lesson works for negative numbers too.