Math Crossword Puzzle

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Across
  1. 2. A symbol that represents an operation.
  2. 3. A group of terms.
  3. 5. Two terms.
  4. 7. A number on its own.
  5. 8. Two things are equal.
  6. 9. A symbol for an unknown number.
Down
  1. 1. A number used to multiply a variable.
  2. 4. Has constants, variables, and the exponents 0,1,2,3,...
  3. 6. One term.
  4. 8. How many times to use the value in a multiplication.