Math Definition Crossword!!

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Across
  1. 1. The letter used to represent unknown numbers.
  2. 5. A branch of mathematics that uses letters and other symbols represent unknown numbers.
  3. 6. A known or fixed quantity; a number.
  4. 8. The process used to find an approximate answer (an estimate)to an arithmetic problem.
  5. 10. An ordered list of numbers that follows a pattern.
Down
  1. 2. Equations that are true no matter what the value is substituted for the variable.
  2. 3. A flat surface that extends infinitely in all directions.
  3. 4. When an equation is never true for any value substituted for the variable.
  4. 7. Each number in the sequence
  5. 9. A group or one or more factors.