Foundations of Algebra

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Across
  1. 4. Counting numbers
  2. 6. Number being multiplied to a variable
  3. 9. Mathematical sentence with variables, numbers and operations
  4. 10. Terms with the same variable raised to same power
  5. 12. Natural number including zero
  6. 14. Two expressions set equal to each other
Down
  1. 1. Mathematical sentence with numbers and operations
  2. 2. A letter that represents for a given value
  3. 3. Number or variable or the product or quotient of a number and variables
  4. 5. Distance a number is from zero
  5. 7. The set of rational and irrational numbers
  6. 8. Whole numbers and their opposites
  7. 11. To substitute a given number for each variable
  8. 13. Repeating and terminating decimal
  9. 15. To replace an expression with its simplest form