CROSSWORD PUZZLES

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Across
  1. 2. law of addition in which two whole numbers (a+b)=(b+a)
  2. 3. natural numbers together with 0
  3. 5. an angle having more than 90° and less than 180°
  4. 6. polygon having seven sides
  5. 7. triangles having two sides equal
Down
  1. 1. a simple closed figure bounded by four line segments
  2. 2. numbers having more than two factors
  3. 4. polygon having nine sides
  4. 8. fractions having same denominators