I'm so Puzzled!

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Across
  1. 5. operation used to find the sum or total
  2. 7. finding the product of two or more numbers
  3. 8. operations involving exponents or indices.
Down
  1. 1. statement that shows expressions are equal, using an equal sign
  2. 2. finding the quotient of two numbers
  3. 3. a combination of symbols, numbers, letters and operators
  4. 4. another word for parenthesis
  5. 6. another word for minus