Math Crossword

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Across
  1. 4. the combination of rational and irrational numbers in the number system.
  2. 6. the action or process of adding something to something else.
  3. 8. the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogues.
  4. 9. a plane figure with three straight sides and three angles.
Down
  1. 1. a diagram in which the numerical values of variables are represented by the height or length of lines or rectangles of equal width.
  2. 2. a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.
  3. 3. a four-sided figure.
  4. 5. the part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations.
  5. 7. the process or skill of taking one number or amount away from another.