math puzzle

1234567891011121314151617181920
Across
  1. 2. numbers in the expression that are similar
  2. 3. terms that have identical variable parts
  3. 7. the numerical factor of a term that contains a variable
  4. 10. variable that has no value
  5. 12. a value or number that never changes
  6. 14. symbol for an unknown number
  7. 15. shows parts of a whole object
  8. 16. a whole number
  9. 18. the linear relationship has a constant
  10. 19. relationships that have straight-line graphs
  11. 20. formed to solve something
Down
  1. 1. usually separates the whole number that is being multipled by two other numbers
  2. 4. sentence with at least two numbers/variables
  3. 5. lowest number in common
  4. 6. two numbers with a product of 1
  5. 8. found after solving an equation
  6. 9. two quantities that have a proportional linear relationship
  7. 11. an example is a(b+c)
  8. 13. a solution to an equation that is a real number
  9. 17. more then one number equal to another number