Algebra words and meanings

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Across
  1. 3. put values into an expression to find an answer
  2. 4. to find the solution to an equation
  3. 7. combine like terms
  4. 8. a number used to multiply a variable
  5. 10. a special name for polynomials with 3 terms
  6. 12. a single number or variable or both multiplied together
  7. 13. terms whose variables (and their exponents) are the same
  8. 16. the answer to an equation
Down
  1. 1. the number of times you use the value in a multiplication
  2. 2. a symbol for a number we don't know yet
  3. 4. to put values into an expression or equation
  4. 5. a number on its own
  5. 6. a special name for polynomials with 2 terms
  6. 9. a group of terms that are separated by + or − signs
  7. 11. a special name for polynomials with 1 term
  8. 14. a statement "this equals that"
  9. 15. to mathematically remove brackets