Math Crossword Puzzle

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Across
  1. 3. A mathematical sentence that shows that two expressions are equivalent
  2. 4. The result when two or more numbers are added
  3. 5. When one number is subtracted
  4. 7. When two or more numbers are multiplied
  5. 8. To find the value of a numerical or algebraic expression
  6. 9. When two or more numbers are divided
Down
  1. 1. A set of whole numbers and their opposites
  2. 2. A symbol to represent a quantity that can change
  3. 4. To replace a variable with a number
  4. 6. A mathematical phrase that contains operations,numbers, and/or variables