mathematics crossword

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Across
  1. 3. pair of numbers to indicate the position of a point
  2. 4. the act of separating numbers into groups
  3. 8. either add or subtract the equations to get an equation in one variable
  4. 9. solving a math problem where the answer is close to the real answer
Down
  1. 1. part of a whole
  2. 2. a straight line shows how steep a straight line is
  3. 5. the act of adding one number to another
  4. 6. answer to a multiplication problem
  5. 7. how much of one thing there is compared to another thing