Crossword

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Across
  1. 3. fraction with numerator less than the denominator
  2. 4. lines that do not intersect
  3. 6. angle less than 90 degree
  4. 7. positive numbers starting from zero to infinity
  5. 9. means moving to the other side of the equation
  6. 10. multiplicative identity
Down
  1. 1. additive identity
  2. 2. pair of angles whose sum is 90 degrees
  3. 5. pair of angles with common vertex and non-parallel arms on either side of the common arm
  4. 8. a+b=b+a