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Even and odd numbers

A number is even if it splits into pairs with nothing left over, and odd if one is always left. Zero is even. The last digit tells you which, because every ten pairs up. Odd plus odd is even.

Depth 1 · Foundation

You can tell even from odd by pairing or by the last digit, know zero is even, and say whether a sum of evens and odds is even or odd.

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Depths of understanding

  1. 1

    Foundation

    You can tell even from odd by pairing or by the last digit, know zero is even, and say whether a sum of evens and odds is even or odd.

    Opens after

    DivisionAn even number divided by 2 leaves remainder 0; an odd number leaves 1.

Your path here

What's still between you and Even and odd numbers, depth 1, in the order you can learn it.

  1. 1CountingDepth 1 · Foundation · Number Systems
  2. 2Natural numbersDepth 1 · Foundation · Number Systems
  3. 3ZeroDepth 1 · Foundation · Number Systems
  4. 4The number lineDepth 1 · Foundation · Number Systems
  5. 5AdditionDepth 1 · Foundation · Arithmetic
  6. 6MultiplicationDepth 1 · Foundation · Arithmetic
  7. 7NumeralsDepth 1 · Foundation · Number Systems
  8. 8Place valueDepth 1 · Foundation · Number Systems
  9. 9Comparing numbersDepth 1 · Foundation · Number Systems
  10. 10IntegersDepth 1 · Foundation · Number Systems
  11. 11SubtractionDepth 1 · Foundation · Arithmetic
  12. 12DivisionDepth 1 · Foundation · Arithmetic
  13. 13Even and odd numbersDepth 1 · Foundation · Arithmetic

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