Making sense of algebra

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Across
  1. 3. A statement involving numbers, variables and arithmetic operations
  2. 7. A mathematical statement that shows that two mathematical expressions are equal
  3. 10. The number of times a number needs to be multiplied by itself
  4. 11. A fact or rule that uses mathematical symbols
  5. 13. The reciprocal of any quantity is 1 divided by that quantity
  6. 14. A number that gets multiplied when using an exponent
  7. 15. A number whose value does not change
Down
  1. 1. A numerical value that is multiplied by a variable
  2. 2. The number of times a number needs to be multiplied by itself
  3. 4. Replacing the variables in an algebraic expression with their numerical value
  4. 5. The number of times a number needs to be multiplied by itself
  5. 6. Terms that have the same variable raised to the same power
  6. 8. A single number or variable, or numbers and variables multiplied together
  7. 9. A letter representing some unknown
  8. 12. A branch of mathematics that uses letters and symbols in place of numbers