Rational Numbers

123456789
Across
  1. 6. the distance from zero to any number
  2. 7. a number without fractions; an integer.
  3. 8. a + b = b + a
  4. 9. A straight line where every point on the line represents a number.
Down
  1. 1. the positive integers (whole numbers) 1, 2, 3, etc., and sometimes zero as well.
  2. 2. is whole-valued positive or negative number or 0
  3. 3. (a + b)+c = a + (b + c) = (a + c) + b
  4. 4. an integer or a number that can be expressed the quotient of two integers (where the denominator does not equal zero)
  5. 5. a + b = c