Math Crossword Puzzle

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Across
  1. 3. dead center of the coordinate plane.
  2. 6. a flip over the X or Y axis.
  3. 7. value a number's distance from zero.
  4. 8. to make smaller; you do this to fractions like 2/4.
Down
  1. 1. expression a combination of variables, numbers,and operations.
  2. 2. a rate with a denominator of one.
  3. 4. a comparison of two amounts with different units.
  4. 5. a comparison between two amounts.