Elijha .s crossword labs

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Across
  1. 5. numbers that can be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero
  2. 7. all numbers used for counting objects
  3. 8. number
  4. 9. numbers that can't be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero
Down
  1. 1. the set of rational numbers together with the set of irrational numbers
  2. 2. notation of numbers is a way in which all numbers are represented, by using a limited set of different digits
  3. 3. a system of writing numbers as the product of a number between 1 and 10 and a power of 10. 999.9 is expressed in scientific notation as 9.999 × 102
  4. 4. positive and negative whole numbers
  5. 6. all natural numbers including zero